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