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();
        }
        
        long miles = 0;
        Arrays.sort(calories, new Comparator<Integer>() {
            @Override
            public int compare(Integer x, Integer y){
                return y - x;
            }
        });
        for(int i = 0; i < calories.length; i++) {
            miles += calories[i] * Math.pow(2, i);
        }
        System.out.println(miles);
    }
}