using System;
using System.Linq;

namespace WrappingEasy_CS
{
    class Program
    {
        static void Main(string[] args)
        {
            
            Solver sol = new Solver();
            sol.Solve();
        }
    }

    class Solver
    {
        int[] L, C;

        public void Solve()
        {

            int min = 0;
            for(int i=0; i<3; i++) min += L[2 - i] * C[i];
            Console.WriteLine(min);
        }

        public Solver()
        {
            int[] tL = ria();
            L = new int[] { 2 * (tL[0] + tL[1]), 2 * (tL[0] + tL[2]), 2 * (tL[1] + tL[2]) };
            C = ria();
            Array.Sort(L);
            Array.Sort(C);
        }

        static String rs() { return Console.ReadLine(); }
        static int ri() { return int.Parse(Console.ReadLine()); }
        static long rl() { return long.Parse(Console.ReadLine()); }
        static double rd() { return double.Parse(Console.ReadLine()); }
        static String[] rsa() { return Console.ReadLine().Split(' '); }
        static int[] ria() { return Console.ReadLine().Split(' ').Select(e => int.Parse(e)).ToArray(); }
        static long[] rla() { return Console.ReadLine().Split(' ').Select(e => long.Parse(e)).ToArray(); }
        static double[] rda() { return Console.ReadLine().Split(' ').Select(e => double.Parse(e)).ToArray(); }
    }
}