// verifast_options{disable_overflow_check target:ILP32}
extern void abort(void);
//@ requires true;
//@ ensures true;


void reach_error()
//@ requires false;
//@ ensures true;
{}void assume_abort_if_not(int cond) 
//@ requires true;
//@ ensures true;
{  if(!cond) {abort();}
}
void __VERIFIER_assert(int cond) 
//@ requires (cond != 0);
//@ ensures (cond != 0);
{  if (!(cond)) {
      ERROR: {reach_error();abort();}
  }
  return;
}
int __VERIFIER_nondet_int();
int main() 
//@ requires module(gj2007b__verifast_instrumented, true);
//@ ensures junk();
{
    //@ open_module(); 
    int x = 0;
    int m = 0;
    int n = __VERIFIER_nondet_int();
while(x < n)
//@ invariant ((((m < n) || (n < 1)) && (0 <= m)) && (0 <= x));
    {
if(__VERIFIER_nondet_int()) 
//@ requires true;
//@ ensures true;
{     m = x;
 }
 x = x + 1;
    }
    __VERIFIER_assert((m >= 0 || n <= 0));
    __VERIFIER_assert((m < n || n <= 0));
    return 0;
}