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


void solve(){
    int n, m;
    std::cin >> n >> m;
    
    int ans = 0;
    if (n == 1) {
        int score[] = {6, 3, 1, 4};
        for (int j = 0; j < m; j++) {
            ans += score[j % 4];
        }
    } else if (m == 1) {
        int score[] = {6, 2, 1, 5};
        for (int j = 0; j < n; j++) {
            ans += score[j % 4];
        }
    } else {
        ans = 6 * n * m;
    }
    std::cout << ans << '\n';
}


signed main(){
    ios::sync_with_stdio(false);
    int t = 1;
    while (t--) solve();
}