// verifast_options{disable_overflow_check target:ILP32}

int SIZE = 50000001;


int __VERIFIER_nondet_int();//@ requires true; 
//@ ensures true;

extern void abort(void);//@ requires true; 
//@ ensures true;

extern void __assert_fail(const char *, const char *, unsigned int, const char *) __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__noreturn__));
void reach_error() //@ requires false; 
//@ ensures true;
{ __assert_fail("0", "loopv1.c", 7, "reach_error"); }
extern void abort(void);
void assume_abort_if_not(int cond) //@ requires true; 
//@ ensures true;
{
  if(!cond) {abort();}
}
void __VERIFIER_assert(int cond) //@ requires integer(&SIZE, ?veri_req_SIZE) &*& (cond != 0); 
//@ ensures integer(&SIZE, ?veri_ens_SIZE) &*& ((cond != 0) && (veri_req_SIZE == veri_ens_SIZE));
{
  if (!(cond)) {
    ERROR: {reach_error();abort();}
  }
  return;
}


int main() //@ requires module(loopv1__verifast_instrumented_modified, true); 
//@ ensures junk();
{
  int n,i,j;
//@ invariant integer(&SIZE, ?veri_req_SIZE) &*& true;
  n = __VERIFIER_nondet_int();
  if (!(n <= SIZE)) return 0;
  i = 0; j=0;
  while(i<n)//@ invariant integer(&SIZE, ?veri_inv_SIZE) &*& ((i % 3) == 0);
{ 
 
    if(__VERIFIER_nondet_int())	  
      i = i + 6; 
    else
     i = i + 3;    
  }
  __VERIFIER_assert( (i%3) == 0 );
  return 0;
}