import java.io.*;
import java.util.*;

public class Solution
{
    public static void main(String[] args)
	{
        Scanner readIn = new Scanner(System.in);
		int n = readIn.nextInt();
		int[] arr = new int[n];
		for(int ii = 0; ii < n; ii++)
			arr[ii] = readIn.nextInt();
		
		Arrays.sort(arr);
		long output = 0;
		long multiplier = 1;
		for(int ii = n - 1; ii >= 0; ii--)
		{
			output += arr[ii] * multiplier;
			multiplier <<= 1;
		}
		
		System.out.println(output);
    }
}