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[] cal = new int[n];
        for(int i=0; i < n; i++){
            cal[i] = in.nextInt();
        }
        
        Arrays.sort(cal);
        long ans=0;
        
        int j=0;
        for(int i=n-1;i>=0;i--)
        {
            ans+=cal[i]*Math.pow(2,j);
            j++;
        }
        
        System.out.println(ans);
        // your code goes here
    }
}