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[] c = Array.ConvertAll(calories_temp,Int32.Parse);
        Array.Sort(c);
        long total = 0;
        for (int i = 0; i < n; i++){
            int j = n - 1 - i;
            total +=  c[j] * (long)Math.Pow(2, i);
        }
        Console.WriteLine(total);
    }
}