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

using i64 = long long;

int main() {
    cin.tie(nullptr)->sync_with_stdio(false);
    
    auto solve = [&]() {
        i64 m, n;
        cin >> m >> n;

        i64 odd = (n + 1) / 2, even = n / 2;

        i64 all = (5 * m + 1) * odd + m * even;
        if (n % 2 == 0) {
            all += 2 * (m - 1);
        }

        i64 sub = odd * m + even * (m - 1);
        sub = (sub + 1) / 2;

        i64 ans = all - sub + 1;
        cout << ans << '\n';
    };

    solve();

    return 0;
}