//https://ncode.syosetu.com/n4830bu/268/
#include <bits/stdc++.h>
using namespace std;

int main() {
    vector<int> L(3), R(3);
    for (int i = 0; i < 3; i++) {
        cin >> L[i];
    }
    for (int i = 0; i < 3; i++) {
        cin >> R[i];
    }
    sort(begin(L), end(L));
    sort(begin(R), end(R));
    cout << 2 * ((L[0] + L[1]) * R[2] + (L[0] + L[2]) * R[1] + (L[1] + L[2]) * R[0]) << endl;
}