// verifast_options{disable_overflow_check target:ILP32}


extern void abort(void);
//@ requires true;
//@ ensures true;
void reach_error()
//@ requires false;
//@ ensures true;
{}void __VERIFIER_assert(int cond) 
//@ requires (cond != 0);
//@ ensures (cond != 0);
{ if(!(cond)) { ERROR: {reach_error();abort();} } }extern bool __VERIFIER_nondet_bool();
int main() 
//@ requires module(bh2017_ex3__verifast_instrumented, true) &*& true;
//@ ensures false &*& junk();
{
    //@ open_module(); 
  int m = 0;
  int n = 0;
while (1)
//@ invariant ((m <= 60) && (n <= 60));
    {
    __VERIFIER_assert(m <= 60);
    __VERIFIER_assert(n <= 60);
if (__VERIFIER_nondet_bool()) 
//@ requires true;
//@ ensures true;
{      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;
}