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();
        }
        for (int i = 0; i < n; i++) 
        {
            for (int j = i + 1; j < n; j++) 
            {
                if (calories[i] < calories[j]) 
                {
                    int temp = calories[i];
                    calories[i] = calories[j];
                    calories[j] = temp;
                }
            }
        }
        long miles=0;
        for (int i = 0; i < n; i++){
            miles=miles+calories[i]*(long)Math.pow(2,i);
        }
        System.out.println(miles);
        // your code goes here
    }
}