#include <bits/stdc++.h>
using namespace std;

int main() {
    int a, b;
    cin >> a >> b;
    int e = a % 4;
    set<int> st = {e, e + 4, e + 8};
    st.erase(a);
    st.erase(b);
    cout << *st.cbegin() << endl;
    return 0;
}