#include <bits/stdc++.h>

using namespace std;

int main() {
  int a, b; cin >> a >> b;
  int ans = 0;

  while (a or b) {
    cout << "value: " << a % 2 << " " << b % 2 << "\n";
    ans += (int)(((a % 2) ^ (b % 2)));
    a >>= 1;
    b >>= 1;
  }
  cout << ans << '\n';
}