#include <bits/stdc++.h>
using namespace std;
#define REP(i, n) for(int(i)=0;(i)<(n);++(i))
int main(){
    int L[6], res = INT_MAX;
    REP(i,6) cin >> L[i];
    REP(i,6){
        res = min(res, L[3]*(L[1]+L[2])*2 + L[4]*(L[0]+L[2])*2 + L[5]*(L[0]+L[1])*2);
        next_permutation(L,L+3);
    }
    cout << res << endl;
}