import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Cupcakes{

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        int[] calories = new int[n];
        long minMiles=0;
        for(int calories_i=0; calories_i < n; calories_i++)
            	calories[calories_i] = in.nextInt();
            Arrays.sort(calories);
            for(int counter=n-1;counter>=0;counter--)
            {
            	minMiles+=(calories[counter])*(Math.pow(2, (n-1)-counter));
            }
            System.out.println(minMiles);
        
        // your code goes here
    }
}