using System;

namespace No268{
    public class Program{
        public static void Main(string[] args){
            var sr = new StreamReader();
            //---------------------------------
            var Ln = sr.Next<int>(3);
            var Rn = sr.Next<int>(3);

            Ln = new[]{Ln[0] + Ln[1], Ln[1] + Ln[2], Ln[2] + Ln[0]};

            Array.Sort(Ln);
            Array.Sort(Rn, (x, y) => y - x);

            var res = 0;
            for(var i = 0; i < 3; i++){
                res += Ln[i] * Rn[i] * 2;
            }

            Console.WriteLine(res);
            //---------------------------------
        }
    }

    public class StreamReader{
        private readonly char[] _c = {' '};
        private int _index = -1;
        private string[] _input = new string[0];

        public T Next<T>(){
            if(_index == _input.Length - 1){
                _index = -1;
                while(true){
                    string rl = Console.ReadLine();
                    if(rl == null){
                        if(typeof(T).IsClass) return default(T);
                        return (T)typeof(T).GetField("MinValue").GetValue(null);
                    }
                    if(rl != ""){
                        _input = rl.Split(_c, StringSplitOptions.RemoveEmptyEntries);
                        break;
                    }
                }
            }
            return (T)Convert.ChangeType(_input[++_index], typeof(T), System.Globalization.CultureInfo.InvariantCulture);
        }

        public T[] Next<T>(int x){
            var result = new T[x];
            for(var i = 0; i < x; ++i) result[i] = Next<T>();
            return result;
        }
    }
}