#include <cstdio>
#include <iostream>

using namespace std;

int main() {
    freopen("snipers.in", "r", stdin);
    freopen("snipers.out", "w", stdout);

    int n, m;
    cin >> n >> m;

    if (n == 1) {
        cout << m;
        return 0;
    }
    if (m == 1) {
        cout << n;
        return 0;
    }

    cout << 2 * n + 2 * m - 4;

    return 0;
}