// 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", "hh-ex3.c", 3, __extension__ __PRETTY_FUNCTION__); })); }
void __VERIFIER_assert(int cond) //@ requires (cond != 0); 
//@ ensures (cond != 0);
{ if(!(cond)) { ERROR: {reach_error();abort();} } }
int main() //@ requires module(hh2012_ex3__verifast_instrumented_modified, true); 
//@ ensures junk();
{
  int i = 0;
  while (i < 4)//@ invariant ((i <= 4) && (0 <= i));
 {
    int j = 0;
    while (j < 4)//@ invariant ((((j == 0) && (0 <= i)) && (i <= 3)) || ((((i <= (j + 3)) && (1 <= j)) && (j <= i)) && (j <= 4)));
 {
      i++;
      j++;
      __VERIFIER_assert(0 <= j);
      __VERIFIER_assert(j <= i);
      __VERIFIER_assert(i <= j + 3);
      __VERIFIER_assert(j <= 4);
    }
    __VERIFIER_assert(0 <= j);
    __VERIFIER_assert(j <= i);
    __VERIFIER_assert(i <= j + 3);
    __VERIFIER_assert(j <= 4);
    i = i - j + 1;
  }
  return 0;
}