/* -*- coding: utf-8 -*-
 *
 * 268.cc: No.268 ラッピング(Easy) - yukicoder
 */

#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<iostream>
#include<string>
#include<vector>
#include<map>
#include<set>
#include<stack>
#include<list>
#include<queue>
#include<deque>
#include<algorithm>
#include<numeric>
#include<utility>
#include<complex>
#include<functional>
 
using namespace std;

/* constant */

const int N = 3;

/* typedef */

/* global variables */

int ls[N], rs[N], wrs[N];

/* subroutines */

/* main */

int main() {
  for (int i = 0; i < N; i++) cin >> ls[i];
  for (int i = 0; i < N; i++) cin >> rs[i];

  int lsum = 0;
  for (int i = 0; i < N; i++) lsum += ls[i];
  for (int i = 0; i < N; i++) wrs[i] = (lsum - ls[i]) * 2;

  sort(wrs, wrs + N);
  sort(rs, rs + N, greater<int>());

  int sum = 0;
  for (int i = 0; i < N; i++) sum += wrs[i] * rs[i];

  printf("%d\n", sum);
  return 0;
}