#include <bits/stdc++.h>
#define PB push_back
#define MP make_pair
#define REP(i,n) for (int i=0;i<(n);i++)
#define FOR(i,a,b) for(int i=(a);i<(b);i++)
#define ALL(a) (a).begin(),(a).end()
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef pair<int,int> P;
const int INF=1e9;
int main(){
  int l[3];
  vector<int> a,b(3);
  REP(i,3)cin>>l[i];
  REP(i,3)cin>>b[i];
  REP(i,3)a.PB(l[i]+l[(i+1)%3]);
  sort(ALL(a));
  sort(ALL(b),greater<int>());
  int ans=0;
  REP(i,3)ans+=a[i]*b[i]*2;
  cout<<ans<<endl;
}