// 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();
//@ requires true;
//@ ensures true;
int main() 
//@ requires module(css2003__verifast_instrumented, true);
//@ ensures junk();
{
    //@ open_module(); 
    int i,j,k;
    i = 1;
    j = 1;
    k = __VERIFIER_nondet_int();
    if (!(0 <= k && k <= 1)) return 0;
while (i < 1000000)
//@ invariant ((((2 <= i) && ((i + k) <= 2)) && (1 <= (i + k))) || (((0 <= k) && (k <= 1)) && (i == 1)));
    {
 i = i + 1;
 j = j + k;
 k = k - 1;
 __VERIFIER_assert(1 <= i + k && i + k <= 2 && i >= 1);
    }
    return 0;
}