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