using System;

public class Program {
    public static void Main() {
        int[] length = Array.ConvertAll<string, int>(Console.ReadLine().Split(), value => int.Parse(value));
        int[] ribbon = Array.ConvertAll<string, int>(Console.ReadLine().Split(), value => int.Parse(value));
        Array.Sort(ribbon);
        int[] wrap = new int[3];
        for (int i = 0; i < 3; i++) wrap[i] = length[i]+length[(i+1)%3];
        Array.Sort(wrap);
        Array.Reverse(wrap);
        int ans = 0;
        for (int i = 0; i < 3; i++) {
            ans += wrap[i] * 2 * ribbon[i];
        }
        Console.WriteLine(ans);
    }
}