// verifast_options{disable_overflow_check target:ILP32}

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", "simple_3-2.c", 3, "reach_error"); }
extern unsigned short __VERIFIER_nondet_ushort(void);//@ requires true; 
//@ ensures true;


void __VERIFIER_assert(int cond) //@ requires (cond != 0); 
//@ ensures (cond != 0);
{
  if (!(cond)) {
    ERROR: {reach_error();abort();}
  }
  return;
}

int main(void) //@ requires module(simple_3_2__verifast_instrumented_modified, true); 
//@ ensures junk();
{
  unsigned int x = 0;
  unsigned short N = __VERIFIER_nondet_ushort();

  while (x < N)//@ invariant ((x % 2) == 0);
 {
    x += 2;
  }

  __VERIFIER_assert(!(x % 2));
}