#include <bits/stdc++.h>

using namespace std;

int main() {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
  vector<int> L(3);
  for (auto &&e : L) {
    cin >> e;
  }
  vector<int> A(3, 0);
  A[0] = 2 * (L[0] + L[1]);
  A[1] = 2 * (L[1] + L[2]);
  A[2] = 2 * (L[2] + L[0]);
  vector<int> B(3);
  for (auto &&e : B) {
    cin >> e;
  }
  sort(A.begin(), A.end());
  sort(B.begin(), B.end(), greater<int>());
  int res = 0;
  for (int i = 0; i < 3; i++) {
    res += A[i] * B[i];
  }
  cout << res << '\n';
  return 0;
}