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();
        List<Integer> calories = new ArrayList<Integer>();
        for(int calories_i=0; calories_i < n; calories_i++){
            int x = in.nextInt();
            calories.add(x);
        }
        Collections.sort(calories);
        
        long ans = 0;
        for(int i=n-1;i>=0;i--){
        	ans+=calories.get(i)*(long)Math.pow(2, n-i-1);
        }
        System.out.println(ans);
    }
}