#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef long double ld;
#define TIME (clock() * 1.0 / CLOCKS_PER_SEC)

void solve() {
    int x, y;
    cin >> x >> y;
    if (x == 0) {
        cout << "4\n";
        return;
    }
    if (x == 1) {
        if (y <= 1) {
            cout << "3\n";
        } else {
            cout << "4\n";
        }
        return;
    }
    cout << "2\n";
}

int main() {
#ifdef ONPC
    freopen("input", "r", stdin);
#endif
    ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);

    int t = 1;
    //cin >> t;
    while (t--) {
        solve();
    }

    return 0;
}