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 miles=0;
        int[] calories = new int[n];
        List<Integer> cal=new ArrayList<Integer>();
        for(int calories_i=0; calories_i < n; calories_i++){
            calories[calories_i] = in.nextInt();
            cal.add(calories[calories_i]);
        }
        Collections.sort(cal);
        Collections.reverse(cal);
        for(int calories_i=0; calories_i < n; calories_i++){
            miles=miles+ (long)(Math.pow(2,calories_i)*cal.get(calories_i));    
          
        }
        System.out.print(miles);
        // your code goes here
    }
}