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();
        }
        
        long sum=0,j=0;
        while(n>0)
            {
            Arrays.sort(calories);
            
             sum=sum+calories[n-1]*(long)Math.pow(2,j);
            //System.out.println(calories[n-1]);
           j=j+1;
            n=n-1;
        }
        System.out.println(sum);
        // your code goes here
    }
}