extern void abort(void);

extern void __assert_fail (const char *__assertion, const char *__file,
      unsigned int __line, const char *__function)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__noreturn__));
extern void __assert_perror_fail (int __errnum, const char *__file,
      unsigned int __line, const char *__function)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__noreturn__));
extern void __assert (const char *__assertion, const char *__file, int __line)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__noreturn__));

void reach_error() { ((void) sizeof ((0) ? 1 : 0), __extension__ ({ if (0) ; else __assert_fail ("0", "scull.c", 3, __extension__ __PRETTY_FUNCTION__); })); }
extern int __VERIFIER_nondet_int();
typedef unsigned char __u_char;
typedef unsigned short int __u_short;
typedef unsigned int __u_int;
typedef unsigned long int __u_long;
typedef signed char __int8_t;
typedef unsigned char __uint8_t;
typedef signed short int __int16_t;
typedef unsigned short int __uint16_t;
typedef signed int __int32_t;
typedef unsigned int __uint32_t;
__extension__ typedef signed long long int __int64_t;
__extension__ typedef unsigned long long int __uint64_t;
__extension__ typedef long long int __quad_t;
__extension__ typedef unsigned long long int __u_quad_t;
__extension__ typedef long long int __intmax_t;
__extension__ typedef unsigned long long int __uintmax_t;
__extension__ typedef __u_quad_t __dev_t;
__extension__ typedef unsigned int __uid_t;
__extension__ typedef unsigned int __gid_t;
__extension__ typedef unsigned long int __ino_t;
__extension__ typedef __u_quad_t __ino64_t;
__extension__ typedef unsigned int __mode_t;
__extension__ typedef unsigned int __nlink_t;
__extension__ typedef long int __off_t;
__extension__ typedef __quad_t __off64_t;
__extension__ typedef int __pid_t;
__extension__ typedef struct { int __val[2]; } __fsid_t;
__extension__ typedef long int __clock_t;
__extension__ typedef unsigned long int __rlim_t;
__extension__ typedef __u_quad_t __rlim64_t;
__extension__ typedef unsigned int __id_t;
__extension__ typedef long int __time_t;
__extension__ typedef unsigned int __useconds_t;
__extension__ typedef long int __suseconds_t;
__extension__ typedef int __daddr_t;
__extension__ typedef int __key_t;
__extension__ typedef int __clockid_t;
__extension__ typedef void * __timer_t;
__extension__ typedef long int __blksize_t;
__extension__ typedef long int __blkcnt_t;
__extension__ typedef __quad_t __blkcnt64_t;
__extension__ typedef unsigned long int __fsblkcnt_t;
__extension__ typedef __u_quad_t __fsblkcnt64_t;
__extension__ typedef unsigned long int __fsfilcnt_t;
__extension__ typedef __u_quad_t __fsfilcnt64_t;
__extension__ typedef int __fsword_t;
__extension__ typedef int __ssize_t;
__extension__ typedef long int __syscall_slong_t;
__extension__ typedef unsigned long int __syscall_ulong_t;
typedef __off64_t __loff_t;
typedef char *__caddr_t;
__extension__ typedef int __intptr_t;
__extension__ typedef unsigned int __socklen_t;
typedef int __sig_atomic_t;
static __inline unsigned int
__bswap_32 (unsigned int __bsx)
{
  return __builtin_bswap32 (__bsx);
}
static __inline __uint64_t
__bswap_64 (__uint64_t __bsx)
{
  return __builtin_bswap64 (__bsx);
}
static __inline __uint16_t
__uint16_identity (__uint16_t __x)
{
  return __x;
}
static __inline __uint32_t
__uint32_identity (__uint32_t __x)
{
  return __x;
}
static __inline __uint64_t
__uint64_identity (__uint64_t __x)
{
  return __x;
}
typedef unsigned int size_t;
typedef __time_t time_t;
struct timespec
{
  __time_t tv_sec;
  __syscall_slong_t tv_nsec;
};
typedef __pid_t pid_t;
struct sched_param
{
  int sched_priority;
};


typedef unsigned long int __cpu_mask;
typedef struct
{
  __cpu_mask __bits[1024 / (8 * sizeof (__cpu_mask))];
} cpu_set_t;

extern int __sched_cpucount (size_t __setsize, const cpu_set_t *__setp)
     __attribute__ ((__nothrow__ , __leaf__));
extern cpu_set_t *__sched_cpualloc (size_t __count) __attribute__ ((__nothrow__ , __leaf__)) ;
extern void __sched_cpufree (cpu_set_t *__set) __attribute__ ((__nothrow__ , __leaf__));


extern int sched_setparam (__pid_t __pid, const struct sched_param *__param)
     __attribute__ ((__nothrow__ , __leaf__));
extern int sched_getparam (__pid_t __pid, struct sched_param *__param) __attribute__ ((__nothrow__ , __leaf__));
extern int sched_setscheduler (__pid_t __pid, int __policy,
          const struct sched_param *__param) __attribute__ ((__nothrow__ , __leaf__));
extern int sched_getscheduler (__pid_t __pid) __attribute__ ((__nothrow__ , __leaf__));
extern int sched_yield (void) __attribute__ ((__nothrow__ , __leaf__));
extern int sched_get_priority_max (int __algorithm) __attribute__ ((__nothrow__ , __leaf__));
extern int sched_get_priority_min (int __algorithm) __attribute__ ((__nothrow__ , __leaf__));
extern int sched_rr_get_interval (__pid_t __pid, struct timespec *__t) __attribute__ ((__nothrow__ , __leaf__));

typedef __clock_t clock_t;
struct tm
{
  int tm_sec;
  int tm_min;
  int tm_hour;
  int tm_mday;
  int tm_mon;
  int tm_year;
  int tm_wday;
  int tm_yday;
  int tm_isdst;
  long int tm_gmtoff;
  const char *tm_zone;
};
typedef __clockid_t clockid_t;
typedef __timer_t timer_t;
struct itimerspec
  {
    struct timespec it_interval;
    struct timespec it_value;
  };
struct sigevent;
struct __locale_struct
{
  struct __locale_data *__locales[13];
  const unsigned short int *__ctype_b;
  const int *__ctype_tolower;
  const int *__ctype_toupper;
  const char *__names[13];
};
typedef struct __locale_struct *__locale_t;
typedef __locale_t locale_t;

extern clock_t clock (void) __attribute__ ((__nothrow__ , __leaf__));
extern time_t time (time_t *__timer) __attribute__ ((__nothrow__ , __leaf__));
extern double difftime (time_t __time1, time_t __time0)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__const__));
extern time_t mktime (struct tm *__tp) __attribute__ ((__nothrow__ , __leaf__));
extern size_t strftime (char *__restrict __s, size_t __maxsize,
   const char *__restrict __format,
   const struct tm *__restrict __tp) __attribute__ ((__nothrow__ , __leaf__));
extern size_t strftime_l (char *__restrict __s, size_t __maxsize,
     const char *__restrict __format,
     const struct tm *__restrict __tp,
     locale_t __loc) __attribute__ ((__nothrow__ , __leaf__));
extern struct tm *gmtime (const time_t *__timer) __attribute__ ((__nothrow__ , __leaf__));
extern struct tm *localtime (const time_t *__timer) __attribute__ ((__nothrow__ , __leaf__));
extern struct tm *gmtime_r (const time_t *__restrict __timer,
       struct tm *__restrict __tp) __attribute__ ((__nothrow__ , __leaf__));
extern struct tm *localtime_r (const time_t *__restrict __timer,
          struct tm *__restrict __tp) __attribute__ ((__nothrow__ , __leaf__));
extern char *asctime (const struct tm *__tp) __attribute__ ((__nothrow__ , __leaf__));
extern char *ctime (const time_t *__timer) __attribute__ ((__nothrow__ , __leaf__));
extern char *asctime_r (const struct tm *__restrict __tp,
   char *__restrict __buf) __attribute__ ((__nothrow__ , __leaf__));
extern char *ctime_r (const time_t *__restrict __timer,
        char *__restrict __buf) __attribute__ ((__nothrow__ , __leaf__));
extern char *__tzname[2];
extern int __daylight;
extern long int __timezone;
extern char *tzname[2];
extern void tzset (void) __attribute__ ((__nothrow__ , __leaf__));
extern int daylight;
extern long int timezone;
extern int stime (const time_t *__when) __attribute__ ((__nothrow__ , __leaf__));
extern time_t timegm (struct tm *__tp) __attribute__ ((__nothrow__ , __leaf__));
extern time_t timelocal (struct tm *__tp) __attribute__ ((__nothrow__ , __leaf__));
extern int dysize (int __year) __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__const__));
extern int nanosleep (const struct timespec *__requested_time,
        struct timespec *__remaining);
extern int clock_getres (clockid_t __clock_id, struct timespec *__res) __attribute__ ((__nothrow__ , __leaf__));
extern int clock_gettime (clockid_t __clock_id, struct timespec *__tp) __attribute__ ((__nothrow__ , __leaf__));
extern int clock_settime (clockid_t __clock_id, const struct timespec *__tp)
     __attribute__ ((__nothrow__ , __leaf__));
extern int clock_nanosleep (clockid_t __clock_id, int __flags,
       const struct timespec *__req,
       struct timespec *__rem);
extern int clock_getcpuclockid (pid_t __pid, clockid_t *__clock_id) __attribute__ ((__nothrow__ , __leaf__));
extern int timer_create (clockid_t __clock_id,
    struct sigevent *__restrict __evp,
    timer_t *__restrict __timerid) __attribute__ ((__nothrow__ , __leaf__));
extern int timer_delete (timer_t __timerid) __attribute__ ((__nothrow__ , __leaf__));
extern int timer_settime (timer_t __timerid, int __flags,
     const struct itimerspec *__restrict __value,
     struct itimerspec *__restrict __ovalue) __attribute__ ((__nothrow__ , __leaf__));
extern int timer_gettime (timer_t __timerid, struct itimerspec *__value)
     __attribute__ ((__nothrow__ , __leaf__));
extern int timer_getoverrun (timer_t __timerid) __attribute__ ((__nothrow__ , __leaf__));
extern int timespec_get (struct timespec *__ts, int __base)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__nonnull__ (1)));

struct __pthread_rwlock_arch_t
{
  unsigned int __readers;
  unsigned int __writers;
  unsigned int __wrphase_futex;
  unsigned int __writers_futex;
  unsigned int __pad3;
  unsigned int __pad4;
  unsigned char __flags;
  unsigned char __shared;
  signed char __rwelision;
  unsigned char __pad2;
  int __cur_writer;
};
typedef struct __pthread_internal_slist
{
  struct __pthread_internal_slist *__next;
} __pthread_slist_t;
struct __pthread_mutex_s
{
  int __lock ;
  unsigned int __count;
  int __owner;
  int __kind;
 
  unsigned int __nusers;
  __extension__ union
  {
    struct { short __espins; short __eelision; } __elision_data;
    __pthread_slist_t __list;
  };
 
};
struct __pthread_cond_s
{
  __extension__ union
  {
    __extension__ unsigned long long int __wseq;
    struct
    {
      unsigned int __low;
      unsigned int __high;
    } __wseq32;
  };
  __extension__ union
  {
    __extension__ unsigned long long int __g1_start;
    struct
    {
      unsigned int __low;
      unsigned int __high;
    } __g1_start32;
  };
  unsigned int __g_refs[2] ;
  unsigned int __g_size[2];
  unsigned int __g1_orig_size;
  unsigned int __wrefs;
  unsigned int __g_signals[2];
};
typedef unsigned long int pthread_t;
typedef union
{
  char __size[4];
  int __align;
} pthread_mutexattr_t;
typedef union
{
  char __size[4];
  int __align;
} pthread_condattr_t;
typedef unsigned int pthread_key_t;
typedef int pthread_once_t;
union pthread_attr_t
{
  char __size[36];
  long int __align;
};
typedef union pthread_attr_t pthread_attr_t;
typedef union
{
  struct __pthread_mutex_s __data;
  char __size[24];
  long int __align;
} pthread_mutex_t;
typedef union
{
  struct __pthread_cond_s __data;
  char __size[48];
  __extension__ long long int __align;
} pthread_cond_t;
typedef union
{
  struct __pthread_rwlock_arch_t __data;
  char __size[32];
  long int __align;
} pthread_rwlock_t;
typedef union
{
  char __size[8];
  long int __align;
} pthread_rwlockattr_t;
typedef volatile int pthread_spinlock_t;
typedef union
{
  char __size[20];
  long int __align;
} pthread_barrier_t;
typedef union
{
  char __size[4];
  int __align;
} pthread_barrierattr_t;
typedef int __jmp_buf[6];
enum
{
  PTHREAD_CREATE_JOINABLE,
  PTHREAD_CREATE_DETACHED
};
enum
{
  PTHREAD_MUTEX_TIMED_NP,
  PTHREAD_MUTEX_RECURSIVE_NP,
  PTHREAD_MUTEX_ERRORCHECK_NP,
  PTHREAD_MUTEX_ADAPTIVE_NP
  ,
  PTHREAD_MUTEX_NORMAL = PTHREAD_MUTEX_TIMED_NP,
  PTHREAD_MUTEX_RECURSIVE = PTHREAD_MUTEX_RECURSIVE_NP,
  PTHREAD_MUTEX_ERRORCHECK = PTHREAD_MUTEX_ERRORCHECK_NP,
  PTHREAD_MUTEX_DEFAULT = PTHREAD_MUTEX_NORMAL
};
enum
{
  PTHREAD_MUTEX_STALLED,
  PTHREAD_MUTEX_STALLED_NP = PTHREAD_MUTEX_STALLED,
  PTHREAD_MUTEX_ROBUST,
  PTHREAD_MUTEX_ROBUST_NP = PTHREAD_MUTEX_ROBUST
};
enum
{
  PTHREAD_PRIO_NONE,
  PTHREAD_PRIO_INHERIT,
  PTHREAD_PRIO_PROTECT
};
enum
{
  PTHREAD_RWLOCK_PREFER_READER_NP,
  PTHREAD_RWLOCK_PREFER_WRITER_NP,
  PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP,
  PTHREAD_RWLOCK_DEFAULT_NP = PTHREAD_RWLOCK_PREFER_READER_NP
};
enum
{
  PTHREAD_INHERIT_SCHED,
  PTHREAD_EXPLICIT_SCHED
};
enum
{
  PTHREAD_SCOPE_SYSTEM,
  PTHREAD_SCOPE_PROCESS
};
enum
{
  PTHREAD_PROCESS_PRIVATE,
  PTHREAD_PROCESS_SHARED
};
struct _pthread_cleanup_buffer
{
  void (*__routine) (void *);
  void *__arg;
  int __canceltype;
  struct _pthread_cleanup_buffer *__prev;
};
enum
{
  PTHREAD_CANCEL_ENABLE,
  PTHREAD_CANCEL_DISABLE
};
enum
{
  PTHREAD_CANCEL_DEFERRED,
  PTHREAD_CANCEL_ASYNCHRONOUS
};

extern int pthread_create (pthread_t *__restrict __newthread,
      const pthread_attr_t *__restrict __attr,
      void *(*__start_routine) (void *),
      void *__restrict __arg) __attribute__ ((__nothrow__)) __attribute__ ((__nonnull__ (1, 3)));
extern void pthread_exit (void *__retval) __attribute__ ((__noreturn__));
extern int pthread_join (pthread_t __th, void **__thread_return);
extern int pthread_detach (pthread_t __th) __attribute__ ((__nothrow__ , __leaf__));
extern pthread_t pthread_self (void) __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__const__));
extern int pthread_equal (pthread_t __thread1, pthread_t __thread2)
  __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__const__));
extern int pthread_attr_init (pthread_attr_t *__attr) __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__nonnull__ (1)));
extern int pthread_attr_destroy (pthread_attr_t *__attr)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__nonnull__ (1)));
extern int pthread_attr_getdetachstate (const pthread_attr_t *__attr,
     int *__detachstate)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__nonnull__ (1, 2)));
extern int pthread_attr_setdetachstate (pthread_attr_t *__attr,
     int __detachstate)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__nonnull__ (1)));
extern int pthread_attr_getguardsize (const pthread_attr_t *__attr,
          size_t *__guardsize)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__nonnull__ (1, 2)));
extern int pthread_attr_setguardsize (pthread_attr_t *__attr,
          size_t __guardsize)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__nonnull__ (1)));
extern int pthread_attr_getschedparam (const pthread_attr_t *__restrict __attr,
           struct sched_param *__restrict __param)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__nonnull__ (1, 2)));
extern int pthread_attr_setschedparam (pthread_attr_t *__restrict __attr,
           const struct sched_param *__restrict
           __param) __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__nonnull__ (1, 2)));
extern int pthread_attr_getschedpolicy (const pthread_attr_t *__restrict
     __attr, int *__restrict __policy)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__nonnull__ (1, 2)));
extern int pthread_attr_setschedpolicy (pthread_attr_t *__attr, int __policy)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__nonnull__ (1)));
extern int pthread_attr_getinheritsched (const pthread_attr_t *__restrict
      __attr, int *__restrict __inherit)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__nonnull__ (1, 2)));
extern int pthread_attr_setinheritsched (pthread_attr_t *__attr,
      int __inherit)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__nonnull__ (1)));
extern int pthread_attr_getscope (const pthread_attr_t *__restrict __attr,
      int *__restrict __scope)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__nonnull__ (1, 2)));
extern int pthread_attr_setscope (pthread_attr_t *__attr, int __scope)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__nonnull__ (1)));
extern int pthread_attr_getstackaddr (const pthread_attr_t *__restrict
          __attr, void **__restrict __stackaddr)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__nonnull__ (1, 2))) __attribute__ ((__deprecated__));
extern int pthread_attr_setstackaddr (pthread_attr_t *__attr,
          void *__stackaddr)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__nonnull__ (1))) __attribute__ ((__deprecated__));
extern int pthread_attr_getstacksize (const pthread_attr_t *__restrict
          __attr, size_t *__restrict __stacksize)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__nonnull__ (1, 2)));
extern int pthread_attr_setstacksize (pthread_attr_t *__attr,
          size_t __stacksize)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__nonnull__ (1)));
extern int pthread_attr_getstack (const pthread_attr_t *__restrict __attr,
      void **__restrict __stackaddr,
      size_t *__restrict __stacksize)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__nonnull__ (1, 2, 3)));
extern int pthread_attr_setstack (pthread_attr_t *__attr, void *__stackaddr,
      size_t __stacksize) __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__nonnull__ (1)));
extern int pthread_setschedparam (pthread_t __target_thread, int __policy,
      const struct sched_param *__param)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__nonnull__ (3)));
extern int pthread_getschedparam (pthread_t __target_thread,
      int *__restrict __policy,
      struct sched_param *__restrict __param)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__nonnull__ (2, 3)));
extern int pthread_setschedprio (pthread_t __target_thread, int __prio)
     __attribute__ ((__nothrow__ , __leaf__));
extern int pthread_once (pthread_once_t *__once_control,
    void (*__init_routine) (void)) __attribute__ ((__nonnull__ (1, 2)));
extern int pthread_setcancelstate (int __state, int *__oldstate);
extern int pthread_setcanceltype (int __type, int *__oldtype);
extern int pthread_cancel (pthread_t __th);
extern void pthread_testcancel (void);
typedef struct
{
  struct
  {
    __jmp_buf __cancel_jmp_buf;
    int __mask_was_saved;
  } __cancel_jmp_buf[1];
  void *__pad[4];
} __pthread_unwind_buf_t __attribute__ ((__aligned__));
struct __pthread_cleanup_frame
{
  void (*__cancel_routine) (void *);
  void *__cancel_arg;
  int __do_it;
  int __cancel_type;
};
extern void __pthread_register_cancel (__pthread_unwind_buf_t *__buf)
     __attribute__ ((__regparm__ (1)));
extern void __pthread_unregister_cancel (__pthread_unwind_buf_t *__buf)
  __attribute__ ((__regparm__ (1)));
extern void __pthread_unwind_next (__pthread_unwind_buf_t *__buf)
     __attribute__ ((__regparm__ (1))) __attribute__ ((__noreturn__))
     __attribute__ ((__weak__))
     ;
struct __jmp_buf_tag;
extern int __sigsetjmp (struct __jmp_buf_tag *__env, int __savemask) __attribute__ ((__nothrow__));
extern int pthread_mutex_init (pthread_mutex_t *__mutex,
          const pthread_mutexattr_t *__mutexattr)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__nonnull__ (1)));
extern int pthread_mutex_destroy (pthread_mutex_t *__mutex)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__nonnull__ (1)));
extern int pthread_mutex_trylock (pthread_mutex_t *__mutex)
     __attribute__ ((__nothrow__)) __attribute__ ((__nonnull__ (1)));
extern int pthread_mutex_lock (pthread_mutex_t *__mutex)
     __attribute__ ((__nothrow__)) __attribute__ ((__nonnull__ (1)));
extern int pthread_mutex_timedlock (pthread_mutex_t *__restrict __mutex,
        const struct timespec *__restrict
        __abstime) __attribute__ ((__nothrow__)) __attribute__ ((__nonnull__ (1, 2)));
extern int pthread_mutex_unlock (pthread_mutex_t *__mutex)
     __attribute__ ((__nothrow__)) __attribute__ ((__nonnull__ (1)));
extern int pthread_mutex_getprioceiling (const pthread_mutex_t *
      __restrict __mutex,
      int *__restrict __prioceiling)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__nonnull__ (1, 2)));
extern int pthread_mutex_setprioceiling (pthread_mutex_t *__restrict __mutex,
      int __prioceiling,
      int *__restrict __old_ceiling)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__nonnull__ (1, 3)));
extern int pthread_mutex_consistent (pthread_mutex_t *__mutex)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__nonnull__ (1)));
extern int pthread_mutexattr_init (pthread_mutexattr_t *__attr)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__nonnull__ (1)));
extern int pthread_mutexattr_destroy (pthread_mutexattr_t *__attr)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__nonnull__ (1)));
extern int pthread_mutexattr_getpshared (const pthread_mutexattr_t *
      __restrict __attr,
      int *__restrict __pshared)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__nonnull__ (1, 2)));
extern int pthread_mutexattr_setpshared (pthread_mutexattr_t *__attr,
      int __pshared)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__nonnull__ (1)));
extern int pthread_mutexattr_gettype (const pthread_mutexattr_t *__restrict
          __attr, int *__restrict __kind)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__nonnull__ (1, 2)));
extern int pthread_mutexattr_settype (pthread_mutexattr_t *__attr, int __kind)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__nonnull__ (1)));
extern int pthread_mutexattr_getprotocol (const pthread_mutexattr_t *
       __restrict __attr,
       int *__restrict __protocol)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__nonnull__ (1, 2)));
extern int pthread_mutexattr_setprotocol (pthread_mutexattr_t *__attr,
       int __protocol)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__nonnull__ (1)));
extern int pthread_mutexattr_getprioceiling (const pthread_mutexattr_t *
          __restrict __attr,
          int *__restrict __prioceiling)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__nonnull__ (1, 2)));
extern int pthread_mutexattr_setprioceiling (pthread_mutexattr_t *__attr,
          int __prioceiling)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__nonnull__ (1)));
extern int pthread_mutexattr_getrobust (const pthread_mutexattr_t *__attr,
     int *__robustness)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__nonnull__ (1, 2)));
extern int pthread_mutexattr_setrobust (pthread_mutexattr_t *__attr,
     int __robustness)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__nonnull__ (1)));
extern int pthread_rwlock_init (pthread_rwlock_t *__restrict __rwlock,
    const pthread_rwlockattr_t *__restrict
    __attr) __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__nonnull__ (1)));
extern int pthread_rwlock_destroy (pthread_rwlock_t *__rwlock)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__nonnull__ (1)));
extern int pthread_rwlock_rdlock (pthread_rwlock_t *__rwlock)
     __attribute__ ((__nothrow__)) __attribute__ ((__nonnull__ (1)));
extern int pthread_rwlock_tryrdlock (pthread_rwlock_t *__rwlock)
  __attribute__ ((__nothrow__)) __attribute__ ((__nonnull__ (1)));
extern int pthread_rwlock_timedrdlock (pthread_rwlock_t *__restrict __rwlock,
           const struct timespec *__restrict
           __abstime) __attribute__ ((__nothrow__)) __attribute__ ((__nonnull__ (1, 2)));
extern int pthread_rwlock_wrlock (pthread_rwlock_t *__rwlock)
     __attribute__ ((__nothrow__)) __attribute__ ((__nonnull__ (1)));
extern int pthread_rwlock_trywrlock (pthread_rwlock_t *__rwlock)
     __attribute__ ((__nothrow__)) __attribute__ ((__nonnull__ (1)));
extern int pthread_rwlock_timedwrlock (pthread_rwlock_t *__restrict __rwlock,
           const struct timespec *__restrict
           __abstime) __attribute__ ((__nothrow__)) __attribute__ ((__nonnull__ (1, 2)));
extern int pthread_rwlock_unlock (pthread_rwlock_t *__rwlock)
     __attribute__ ((__nothrow__)) __attribute__ ((__nonnull__ (1)));
extern int pthread_rwlockattr_init (pthread_rwlockattr_t *__attr)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__nonnull__ (1)));
extern int pthread_rwlockattr_destroy (pthread_rwlockattr_t *__attr)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__nonnull__ (1)));
extern int pthread_rwlockattr_getpshared (const pthread_rwlockattr_t *
       __restrict __attr,
       int *__restrict __pshared)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__nonnull__ (1, 2)));
extern int pthread_rwlockattr_setpshared (pthread_rwlockattr_t *__attr,
       int __pshared)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__nonnull__ (1)));
extern int pthread_rwlockattr_getkind_np (const pthread_rwlockattr_t *
       __restrict __attr,
       int *__restrict __pref)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__nonnull__ (1, 2)));
extern int pthread_rwlockattr_setkind_np (pthread_rwlockattr_t *__attr,
       int __pref) __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__nonnull__ (1)));
extern int pthread_cond_init (pthread_cond_t *__restrict __cond,
         const pthread_condattr_t *__restrict __cond_attr)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__nonnull__ (1)));
extern int pthread_cond_destroy (pthread_cond_t *__cond)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__nonnull__ (1)));
extern int pthread_cond_signal (pthread_cond_t *__cond)
     __attribute__ ((__nothrow__)) __attribute__ ((__nonnull__ (1)));
extern int pthread_cond_broadcast (pthread_cond_t *__cond)
     __attribute__ ((__nothrow__)) __attribute__ ((__nonnull__ (1)));
extern int pthread_cond_wait (pthread_cond_t *__restrict __cond,
         pthread_mutex_t *__restrict __mutex)
     __attribute__ ((__nonnull__ (1, 2)));
extern int pthread_cond_timedwait (pthread_cond_t *__restrict __cond,
       pthread_mutex_t *__restrict __mutex,
       const struct timespec *__restrict __abstime)
     __attribute__ ((__nonnull__ (1, 2, 3)));
extern int pthread_condattr_init (pthread_condattr_t *__attr)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__nonnull__ (1)));
extern int pthread_condattr_destroy (pthread_condattr_t *__attr)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__nonnull__ (1)));
extern int pthread_condattr_getpshared (const pthread_condattr_t *
     __restrict __attr,
     int *__restrict __pshared)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__nonnull__ (1, 2)));
extern int pthread_condattr_setpshared (pthread_condattr_t *__attr,
     int __pshared) __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__nonnull__ (1)));
extern int pthread_condattr_getclock (const pthread_condattr_t *
          __restrict __attr,
          __clockid_t *__restrict __clock_id)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__nonnull__ (1, 2)));
extern int pthread_condattr_setclock (pthread_condattr_t *__attr,
          __clockid_t __clock_id)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__nonnull__ (1)));
extern int pthread_spin_init (pthread_spinlock_t *__lock, int __pshared)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__nonnull__ (1)));
extern int pthread_spin_destroy (pthread_spinlock_t *__lock)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__nonnull__ (1)));
extern int pthread_spin_lock (pthread_spinlock_t *__lock)
     __attribute__ ((__nothrow__)) __attribute__ ((__nonnull__ (1)));
extern int pthread_spin_trylock (pthread_spinlock_t *__lock)
     __attribute__ ((__nothrow__)) __attribute__ ((__nonnull__ (1)));
extern int pthread_spin_unlock (pthread_spinlock_t *__lock)
     __attribute__ ((__nothrow__)) __attribute__ ((__nonnull__ (1)));
extern int pthread_barrier_init (pthread_barrier_t *__restrict __barrier,
     const pthread_barrierattr_t *__restrict
     __attr, unsigned int __count)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__nonnull__ (1)));
extern int pthread_barrier_destroy (pthread_barrier_t *__barrier)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__nonnull__ (1)));
extern int pthread_barrier_wait (pthread_barrier_t *__barrier)
     __attribute__ ((__nothrow__)) __attribute__ ((__nonnull__ (1)));
extern int pthread_barrierattr_init (pthread_barrierattr_t *__attr)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__nonnull__ (1)));
extern int pthread_barrierattr_destroy (pthread_barrierattr_t *__attr)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__nonnull__ (1)));
extern int pthread_barrierattr_getpshared (const pthread_barrierattr_t *
        __restrict __attr,
        int *__restrict __pshared)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__nonnull__ (1, 2)));
extern int pthread_barrierattr_setpshared (pthread_barrierattr_t *__attr,
        int __pshared)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__nonnull__ (1)));
extern int pthread_key_create (pthread_key_t *__key,
          void (*__destr_function) (void *))
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__nonnull__ (1)));
extern int pthread_key_delete (pthread_key_t __key) __attribute__ ((__nothrow__ , __leaf__));
extern void *pthread_getspecific (pthread_key_t __key) __attribute__ ((__nothrow__ , __leaf__));
extern int pthread_setspecific (pthread_key_t __key,
    const void *__pointer) __attribute__ ((__nothrow__ , __leaf__)) ;
extern int pthread_getcpuclockid (pthread_t __thread_id,
      __clockid_t *__clock_id)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__nonnull__ (2)));
extern int pthread_atfork (void (*__prepare) (void),
      void (*__parent) (void),
      void (*__child) (void)) __attribute__ ((__nothrow__ , __leaf__));

int i;
pthread_mutex_t lock;
inline int down_interruptible() {
  pthread_mutex_lock(&lock);
  return 0;
}
inline void up() {
  pthread_mutex_unlock(&lock);
  return;
}
inline int copy_to_user(int to, int from, int n) {
  to = from;
  return __VERIFIER_nondet_int();
}
inline int copy_from_user(int to, int from, int n) {
  to = from;
  return __VERIFIER_nondet_int();
}
inline int __get_user(int size, int ptr)
{
  return __VERIFIER_nondet_int();
}
inline int __put_user(int size, int ptr)
{
    return __VERIFIER_nondet_int();
}
int scull_quantum = 4000;
int scull_qset = 1000;
int dev_data;
int dev_quantum;
int dev_qset;
int dev_size;
int __X__;
int scull_trim(int dev)
{
  int qset = dev_qset;
  dev_size = 0;
  dev_quantum = scull_quantum;
  dev_qset = scull_qset;
  dev_data = 0;
  return 0;
}
inline int scull_open(int tid, int i, int filp)
{
  int dev;
  dev = i;
  filp = dev;
  if (down_interruptible())
    return -512;
  __X__ = 2;
  scull_trim(dev);
  if (!(__X__ >= 2)) ERROR: {reach_error();abort();}
  up();
  return 0;
}
inline int scull_follow(int dev, int n) {
  return __VERIFIER_nondet_int();
}
inline int scull_read(int tid, int filp, int buf, int count,
     int f_pos)
{
  int dev = filp;
  int dptr;
  int quantum = dev_quantum, qset = dev_qset;
  int itemsize = quantum * qset;
  int item, s_pos, q_pos, rest;
  int retval = 0;
  if (down_interruptible())
    return -512;
  __X__ = 0;
  if (f_pos >= dev_size)
    goto out;
  if (f_pos+count >= dev_size)
    count = dev_size - f_pos;
  item = f_pos / itemsize;
  rest = f_pos;
   s_pos = rest / quantum; q_pos = rest;
   dptr = scull_follow(dev, item);
   if (count > quantum - q_pos)
     count = quantum - q_pos;
  if (copy_to_user(buf, dev_data + s_pos + q_pos, count)) {
    retval = -2;
    goto out;
  }
  f_pos += count;
  retval = count;
  if (!(__X__ <= 0)) ERROR: {reach_error();abort();}
 out:
  up();
  return retval;
}
inline int scull_write(int tid, int filp, int buf, int count,
      int f_pos)
{
  int dev = filp;
  int dptr;
  int quantum = dev_quantum, qset = dev_qset;
  int itemsize = quantum * qset;
  int item, s_pos, q_pos, rest;
  int retval = -4;
  if (down_interruptible())
    return -512;
  item = f_pos / itemsize;
  rest = f_pos;
  s_pos = rest / quantum; q_pos = rest;
  dptr = scull_follow(dev, item);
  if (dptr == 0)
    goto out;
  if (count > quantum - q_pos)
    count = quantum - q_pos;
  __X__ = 1;
  if (copy_from_user(dev_data+s_pos+q_pos, buf, count)) {
    retval = -2;
    goto out;
  }
  f_pos += count;
  retval = count;
  if (dev_size < f_pos)
    dev_size = f_pos;
  if (!(__X__ == 1)) ERROR: {reach_error();abort();}
 out:
  up();
  return retval;
}
inline int scull_ioctl(int i, int filp,
                 int cmd, int arg)
{
 int err = 0, tmp;
 int retval = 0;
 switch(cmd) {
   case 0:
  scull_quantum = 4000;
  scull_qset = 1000;
  break;
   case 1:
  retval = __get_user(scull_quantum, arg);
  break;
   case 3:
  scull_quantum = arg;
  break;
   case 5:
  retval = __put_user(scull_quantum, arg);
  break;
   case 7:
  return scull_quantum;
   case 9:
  tmp = scull_quantum;
  retval = __get_user(scull_quantum, arg);
  if (retval == 0)
   retval = __put_user(tmp, arg);
  break;
   case 11:
  tmp = scull_quantum;
  scull_quantum = arg;
  return tmp;
   case 2:
  retval = __get_user(scull_qset, arg);
  break;
   case 4:
  scull_qset = arg;
  break;
   case 6:
  retval = __put_user(scull_qset, arg);
  break;
   case 8:
  return scull_qset;
   case 10:
  tmp = scull_qset;
  retval = __get_user(scull_qset, arg);
  if (retval == 0)
   retval = __put_user(tmp, arg);
  break;
   case 12:
  tmp = scull_qset;
  scull_qset = arg;
  return tmp;
   default:
  return -25;
 }
 return retval;
}
inline int scull_llseek(int filp, int off, int whence, int f_pos)
{
  int dev = filp;
  int newpos;
  switch(whence) {
  case 0:
    newpos = off;
    break;
  case 1:
    newpos = filp + f_pos + off;
    break;
  case 2:
    newpos = dev_size + off;
    break;
  default:
    return -28;
  }
  if (newpos < 0) return -28;
  filp = newpos;
  return newpos;
}
inline void scull_cleanup_module(void)
{
  int dev=__VERIFIER_nondet_int();
  scull_trim(dev);
}
inline int scull_init_module()
{
  int result = 0;
  return 0;
 fail:
  scull_cleanup_module();
  return result;
}
void *loader(void *arg) {
  scull_init_module();
  scull_cleanup_module();
  return 0;
}
void *thread1(void *arg) {
  int filp=__VERIFIER_nondet_int();
  int buf=__VERIFIER_nondet_int();
  int count = 10;
  int off = 0;
  scull_open(1, i, filp);
  scull_read(1, filp, buf, count, off);
  0;
  return 0;
}
void *thread2(void *arg) {
  int filp=__VERIFIER_nondet_int();
  int buf=__VERIFIER_nondet_int();
  int count = 10;
  int off = 0;
  scull_open(2, i, filp);
  scull_write(2, filp, buf, count, off);
  0;
  return 0;
}
int main() {
  pthread_t t1, t2, t3;
  pthread_mutex_init(&lock, 0);
  pthread_create(&t1, 0, loader, 0);
  pthread_create(&t2, 0, thread1, 0);
  pthread_create(&t3, 0, thread2, 0);
  pthread_join(t1, 0);
  pthread_join(t2, 0);
  pthread_join(t3, 0);
  pthread_mutex_destroy(&lock);
  return 0;
}