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