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);
        
        List<int> caloriesList = new List<int>(calories);
        long miles = 0;
        
        caloriesList.Sort((a, b) => -1* a.CompareTo(b));
        
        for (int i = 0; i < n; i++) {
            miles += caloriesList[i] * (long)Math.Pow(2,i);
        }
        
        Console.WriteLine(miles);
    }
}