// verifast_options{disable_overflow_check target:ILP32}
extern void abort(void);
//@ requires true;
//@ ensures true;
void reach_error()
//@ requires false;
//@ ensures true;
{}
// Category: Loops
// Verification result: TRUE
extern int __VERIFIER_nondet_int();
void __VERIFIER_assert(int cond)
//@ requires (1 <= cond);
//@ ensures (1 <= cond);
{  if(!(cond))
  ERROR: {reach_error();abort();}
  return;
}

int main()
//@ requires module(mod3__verifast_instrumented, true);
//@ ensures junk();
{
    //@ open_module(); 
  unsigned int x = __VERIFIER_nondet_int();
  unsigned int y = 1;
  
while(__VERIFIER_nondet_int())
//@ invariant ((y == 1) || ((x % 3) < 1));
    {
    if(x % 3 == 1){
      x += 2; y = 0;}
    else{
      if(x % 3 == 2){
	x += 1; y = 0;}
      else{
if(__VERIFIER_nondet_int())
//@ requires true;
//@ ensures true;
{	  x += 4; y = 1;}
	else{
	  x += 5; y = 1;}
      }
    }
  }
  if(y == 0)
    __VERIFIER_assert(x % 3 == 0);
  return 0;
}