import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        int[] calories = new int[n];
        for(int calories_i=0; calories_i < n; calories_i++){
            calories[calories_i] = in.nextInt();
        }
        in.close();
        
        long total = 0;
        Arrays.sort(calories);
        
        for(int i = calories.length - 1; i >= 0; i--){
            total += Math.pow(2, i) * calories[calories.length -1 - i];
        }
        
        System.out.println(total);
        // your code goes here
    }
}