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();
        Integer[] calories = new Integer[n];
        for(int calories_i=0; calories_i < n; calories_i++){
            calories[calories_i] = in.nextInt();
        }
        List<Integer> calList = Arrays.asList(calories);
        Collections.sort(calList, Collections.reverseOrder());

        long cals = 0;
        for (int i=0;i<calList.size();i++) {
            cals += Math.pow(2,i)*calList.get(i);
        }
        System.out.println(cals);
    }
}