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();
        }
       
        int cupCakeCount = 0;
        Arrays.sort(calories);
        
        long toWalk = 0;
        for(int i = n-1; i >= 0; i-- ){
            
           toWalk += (calories[i] * (long)Math.pow(2,cupCakeCount++)); 
        }
        
        System.out.println(toWalk);
    }
}