#include <algorithm>
#include <cmath>
#include <cstdio>
#include <iostream>
#include <vector>

#define int long long
const int a1[5] = {6, 3, 1, 4};
const int a2[5] = {6, 2, 1, 5};
signed main() {
    int n, m, ans = 0;
    std::cin >> n >> m;
    if (n == 1) {
        for (int i = 0; i < m; i++) ans += a1[i % 4];
    } else if (m == 1) {
        for (int i = 0; i < n; i++) ans += a2[i % 4];
    } else {
        ans = n * m * 6;
    }
    std::cout << ans << std::endl;
    return 0;
}