#include <iostream>
#include  <fstream>
using namespace std;

int main() {
    ifstream f("adunare.in");
    ofstream g("adunare.out");

    int a, b;
    f >> a >> b;
    int mask, a_bit, b_bit;
    int transp = 0, result = 0;

    for (mask = 1; mask; mask <<= 1) {
        result |= (a_bit = a & mask) ^ (b_bit = b & mask) ^ transp;
        transp = (a_bit & b_bit) | (a_bit & transp) | ( b_bit & transp);
        transp <<=  1;
    }
    g << result;
}