using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ProjectEuler
{
    internal class Program
    {

        private static void Main(string[] args)
        {
            var n = ReadLong();
            var vals = ReadLongList();

            var orderedVals = vals.OrderByDescending(s => s).ToList();

            long sum = 0;
            for (int i = 0; i < n; i++)
            {
                sum += (long)Math.Pow(2, i) * orderedVals[i];
            }
            Console.WriteLine(sum);
            //Console.ReadLine();
        }


        public static void Solve()
        {
        }

        public static long ReadLong()
        {
            var token = Console.ReadLine();
            return long.Parse(token);
        }

        public static IList<long> ReadLongList()
        {
            return Console.ReadLine().Split(' ').Select(long.Parse).ToList();
        }

        public static IList<string> ReadStringList()
        {
            return Console.ReadLine().Split(' ').ToList();
        }
    }
}