using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
class Solution{
    
    static long PowTwo(long pow)
    {
        if(pow == 0)
            return 1;
        long product = 1;
        for(int i = 1; i <= pow; ++i)
            product *= 2;
        return  product;
    }

    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);
        calories = calories.OrderBy(c => c).Reverse().ToArray();
        long count = 0;
        for(int i = 0; i < calories.Length; ++i)
        {
            count = count + calories[i] * PowTwo(i);
        }
        Console.WriteLine(count);
    }
}