/* -*- coding: utf-8 -*-
 *
 * 3150.cc:  No.3150 count X which satisfies with equlation - yukicoder
 */

#include<cstdio>
#include<algorithm>

using namespace std;

/* constant */

const int MAX_X = 256;

/* main */

int main() {
  int a, b;
  scanf("%d%d", &a, &b);

  int cnt = 0;
  for (int x = 0; x < MAX_X; x++)
    if ((a | x) == b) cnt++;

  printf("%d\n", cnt);

  return 0;
}