using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
class Solution
{

    static void Main(String[] args)
    {
        int n = Convert.ToInt32(Console.ReadLine());
        string[] calories_temp = Console.ReadLine().Split(' ');
        int[] calories = Array.ConvertAll(calories_temp, Int32.Parse);
        // your code goes here
        Array.Sort(calories);
        Array.Reverse(calories);

        long miles = 0;

        for (int i = 0; i < n; i++)
        {
            miles += calories[i] * Convert.ToInt64(Math.Pow(2, i));
        }

        Console.WriteLine(miles);
        Console.ReadLine();
    }
}