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 = Integer.parseInt(in.nextLine());
        int[] cupcakes = new int[n];
        for (int i = 0; i < n; i++) {
            cupcakes[i] = in.nextInt();
        }
        
        Arrays.sort(cupcakes);

        long calories = 0L;
        int index = 0;
        for (int i = cupcakes.length - 1; i >= 0; i--) {
            calories = calories + cupcakes[i] * (long)Math.pow(2, index);
            index++;
        }

        System.out.println(calories);
    }
}