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());
        int[] calories = Array.ConvertAll(Console.ReadLine().Split(' '), Int32.Parse);
        
        long miles = 0;
        //Step 1: sort cupcakes in increasing order
        Array.Sort(calories);
        
        //Step 2: walk through cupcakes backwards
        for(int i = n - 1, j = 0 ; i >= 0; i--, j++){
            miles = miles + (calories[i] * (long)Math.Pow(2, j));
        }
        Console.WriteLine(miles);
    }
}