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