#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;

#define RREP(i,s,e) for (i = e-1; i >= s; i--)
#define rrep(i,n) RREP(i,0,n)
#define REP(i,s,e) for (i = s; i < e; i++)
#define rep(i,n) REP(i,0,n)
#define INF 1e8

typedef long long ll;

int main() {
    int i;
    int l[3], c[3];
    rep (i,3) cin >> l[i];
    rep (i,3) cin >> c[i];
    sort(l,l+3);
    sort(c,c+3);
    cout << 2*(c[0]*(l[1]+l[2])+c[1]*(l[0]+l[2])+c[2]*(l[0]+l[1])) << endl;
    return 0;
}