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();
        }
        Arrays.sort(calories);
        long result = 0;
        for (int i = calories.length - 1; i > -1; i--) {
            int i1 = calories.length - 1 - i;
//            System.out.println(i1);
            long shift = 1L << i1;
            result = result + calories[i]* shift;
//            System.out.println("SHIFT: " + shift + " C:" + calories[i] + " => " + result);
        }
        System.out.println(result);
    }
}