import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Scanner;

public class Solution {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        List<Integer> calories = new ArrayList<>();
        for (int calories_i = 0; calories_i < n; calories_i++) {
            calories.add(in.nextInt());
        }
        Collections.sort(calories);
        long res = 0;
        long pow2 = 1;
        for (int i = calories.size() - 1; i >= 0; i--) {
            res += calories.get(i) * pow2;
            pow2 *= 2;

        }
        System.out.println(res);
        // your code goes here
    }
}