P1001
#include <bits/stdc++.h>
#define int long long
using namespace std;
int a, b;
signed main() {
cin >> a >> b;
int c = (a & b) << 1;
a = a ^ b;
b = c;
c = (a & b) << 1;
a = a ^ b;
b = c;
c = (a & b) << 1;
a = a ^ b;
b = c;
c = (a & b) << 1;
a = a ^ b;
b = c;
c = (a & b) << 1;
a = a ^ b;
b = c;
c = (a & b) << 1;
a = a ^ b;
b = c;
c = (a & b) << 1;
a = a ^ b;
b = c;
c = (a & b) << 1;
a = a ^ b;
b = c;
c = (a & b) << 1;
a = a ^ b;
b = c;
c = (a & b) << 1;
a = a ^ b;
b = c;
c = (a & b) << 1;
a = a ^ b;
b = c;
c = (a & b) << 1;
a = a ^ b;
b = c;
c = (a & b) << 1;
a = a ^ b;
b = c;
c = (a & b) << 1;
a = a ^ b;
b = c;
c = (a & b) << 1;
a = a ^ b;
b = c;
c = (a & b) << 1;
a = a ^ b;
b = c;
c = (a & b) << 1;
a = a ^ b;
b = c;
c = (a & b) << 1;
a = a ^ b;
b = c;
c = (a & b) << 1;
a = a ^ b;
b = c;
c = (a & b) << 1;
a = a ^ b;
b = c;
c = (a & b) << 1;
a = a ^ b;
b = c;
c = (a & b) << 1;
a = a ^ b;
b = c;
c = (a & b) << 1;
a = a ^ b;
b = c;
c = (a & b) << 1;
a = a ^ b;
b = c;
c = (a & b) << 1;
a = a ^ b;
b = c;
c = (a & b) << 1;
a = a ^ b;
b = c;
c = (a & b) << 1;
a = a ^ b;
b = c;
c = (a & b) << 1;
a = a ^ b;
b = c;
c = (a & b) << 1;
a = a ^ b;
b = c;
c = (a & b) << 1;
a = a ^ b;
b = c;
c = (a & b) << 1;
a = a ^ b;
b = c;
c = (a & b) << 1;
a = a ^ b;
b = c;
c = (a & b) << 1;
a = a ^ b;
b = c;
c = (a & b) << 1;
a = a ^ b;
b = c;
c = (a & b) << 1;
a = a ^ b;
b = c;
c = (a & b) << 1;
a = a ^ b;
b = c;
c = (a & b) << 1;
a = a ^ b;
b = c;
c = (a & b) << 1;
a = a ^ b;
b = c;
c = (a & b) << 1;
a = a ^ b;
b = c;
c = (a & b) << 1;
a = a ^ b;
b = c;
c = (a & b) << 1;
a = a ^ b;
b = c;
c = (a & b) << 1;
a = a ^ b;
b = c;
c = (a & b) << 1;
a = a ^ b;
b = c;
c = (a & b) << 1;
a = a ^ b;
b = c;
c = (a & b) << 1;
a = a ^ b;
b = c;
c = (a & b) << 1;
a = a ^ b;
b = c;
c = (a & b) << 1;
a = a ^ b;
b = c;
c = (a & b) << 1;
a = a ^ b;
b = c;
c = (a & b) << 1;
a = a ^ b;
b = c;
c = (a & b) << 1;
a = a ^ b;
b = c;
cout << a;
return 0;
}