// 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();}
  }
  return;
}

extern bool __VERIFIER_nondet_bool();
//@ requires true;
//@ ensures true;

int main()
//@ requires module(n_c11__verifast_instrumented, true);
//@ ensures junk();
{
    //@ open_module(); 
   int a[5];
   unsigned int len=0;

   int i;


while(__VERIFIER_nondet_bool())
//@ invariant (len < 5);
    {
     
      if (len==4)
         len =0;
      
      a[len]=0;

      len++;
   }
   __VERIFIER_assert(len>=0 && len<5);
   return 1;

   
 return 0; }