import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;
import java.lang.*;
class Solution
{
	public static void main(String[] args) 
	{
		Scanner in = new Scanner(System.in);	
		int n = in.nextInt();
		long  sum = 0 ;
		int arr[] = new int[n];
		for(int i = 0 ; i < n ; i++)
		{
			arr[i] = in.nextInt();
		}
		Arrays.sort(arr);
		for(int i = n-1 ; i > -1 ; i--)
		{
			sum += arr[i]*Math.pow(2,n-1-i);
		}
		System.out.println(sum);
	}
}