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);
        long a=0;
        int j=0;
        for(int i=n-1;i>=0;i--)
        {
        	a+=((long)Math.Pow(2,j)*calories[i]);
            j++;
        }
        Console.WriteLine(a);
        
    }
}