#include <bits/stdc++.h>

using namespace std;
unsigned seed = chrono :: system_clock :: now().time_since_epoch().count();
mt19937 rng(seed);
int add(int a, int b) {
  return a & b ? add((a & b) << 1, a ^ b) : a | b;
}

int main()
{
  ifstream cin("adunare.in");
  ofstream cout("adunare.out");
    int a, b;
    cin >> a >> b;
    cout << add(a, b);
    return 0;
}