#include <bits/stdc++.h>
using namespace std;

signed main(){
  int L1, L2, L3; cin >> L1 >> L2 >> L3;
  int X[ 3 ]; cin >> X[ 0 ] >> X[ 1 ] >> X[ 2 ];
  sort( X, X + 3 );
  int w[ 3 ] = { L1 + L2, L2 + L3, L3 + L1 };
  sort( w, w + 3, greater< int >() );
  cout << 2 * ( X[ 0 ] * w[ 2 ] + X[ 1 ] * w[ 1 ] + X[ 2 ] * w[ 0 ] ) << endl;
  return 0;
}