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