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();
        long miles = 0;
        int[] calories = new int[n];
        for(int i=0; i < n; i++){
            calories[i] = in.nextInt();
        }
        
        Arrays.sort(calories);
        int count = 0;
        
        for(int i = n-1; i>=0; i--)
        {
            miles = miles + calories[i]*(long)Math.pow(2, count);
            count++;
        }
        System.out.println(miles);
    }
}