using System;

public class Hello
{
    public static void Main()
    {
        string[] line = Console.ReadLine().Trim().Split(' ');
        var a2 = Array.ConvertAll(line, int.Parse);
        var a = new int[3];
        a[0] = a2[0] + a2[1]; a[1] = a2[1] + a2[2]; a[2] = a2[2] + a2[0];
        line = Console.ReadLine().Trim().Split(' ');
        var b = Array.ConvertAll(line, int.Parse);
        Array.Sort(a);
        Array.Sort(b);
        var ans = a[0] * b[2] + a[1] * b[1] + a[2] * b[0];
        ans *= 2;
        Console.WriteLine(ans);
    }
}