void abort() { };
                                                                                                                                                          
                                                                             
extern unsigned int __VERIFIER_nondet_uint();

/*@ 
    requires ((1 <= cond)) && (cond != 0);
    ensures ((1 <= cond)) && (1);
@*/
void __VERIFIER_assert(int cond) {
  if (!(cond)) {
    ERROR: {/*@ assert(0); */;abort();}
  }
  return;
}

int main() {
  unsigned int x = 0;
  unsigned int y = __VERIFIER_nondet_uint();

/*@
loop invariant ((((x == 0) || (((y % 2) != 0) && (((long long) 5 + x) == 0))) || (((y % 2) == 0) && ((x % 2) == 0))));
@*/
  while (x < 99) {
    if (y % 2 == 0) x += 2;
    else x++;

    if (y % 2 == 0) x += 2;
    else x -= 2;

    if (y % 2 == 0) x += 2;
    else x += 2;

    if (y % 2 == 0) x += 2;
    else x -= 2;

    if (y % 2 == 0) x += 2;
    else x += 2;

    if (y % 2 == 0) x += 2;
    else x -= 4;

    if (y % 2 == 0) x += 2;
    else x += 4;

    if (y % 2 == 0) x += 2;
    else x += 2;

    if (y % 2 == 0) x += 2;
    else x -= 4;

    if (y % 2 == 0) x += 2;
    else x -= 4;
  }

  __VERIFIER_assert((x % 2) == (y % 2));
}