// verifast_options{disable_overflow_check target:ILP32}


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__));

extern void abort(void);//@ requires true; 
//@ ensures true;

void reach_error() //@ requires false; 
//@ ensures true;
{ ((void) sizeof ((0) ? 1 : 0), __extension__ ({ if (0) ; else __assert_fail ("0", "bh-ex3.c", 3, __extension__ __PRETTY_FUNCTION__); })); }
void __VERIFIER_assert(int cond) //@ requires (cond != 0); 
//@ ensures (cond != 0);
{ if(!(cond)) { ERROR: {reach_error();abort();} } }
extern _Bool __VERIFIER_nondet_bool();//@ requires true; 
//@ ensures true;

int main() //@ requires module(bh2017_ex3__verifast_instrumented_modified, true); 
//@ ensures junk();
{
  int m = 0;
//@ invariant true;
  int n = 0;
  while (1)//@ invariant ((m <= 60) && (n <= 60));
 {
    __VERIFIER_assert(m <= 60);
    __VERIFIER_assert(n <= 60);
    if (__VERIFIER_nondet_bool()) {
      if (__VERIFIER_nondet_bool()) {
        if (m < 60) {
          m++;
        }
        else {
          __VERIFIER_assert(m == 60);
          m = 0;
        }
      }
    }
    else {
      if (__VERIFIER_nondet_bool()) {
        if (n < 60) {
          n++;
        }
        else {
          __VERIFIER_assert(n == 60);
          n = 0;
        }
      }
    }
  }
  return 0;
}