#include <iostream>
#include <vector>
#include <string>
#include <cstring>
#include <math.h>
#include <cmath>
#include <limits.h>
#include <map>
#include <set>
#include <queue>
#include <algorithm>
#include <functional>
#include <stdio.h>
using namespace std;

long long MOD = 1000000007;

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