import java.io.*;
import java.util.Arrays;
public class CakeWalk {

	public static void main(String[] args) throws IOException {
		// TODO Auto-generated method stub
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		int n = Integer.parseInt(br.readLine());
		String[] str = br.readLine().split("\\s");
		int[] arr = new int[n];
		for(int i = 0 ; i < n ; i++)
		{
			arr[i] = Integer.parseInt(str[i]);
		}
		
		func(arr,n);
	}

	private static void func(int[] arr, int n) {
		// TODO Auto-generated method stub
		Arrays.sort(arr);
		long miles = 0;
		int count = 0;
		for(int i = n - 1 ; i >= 0 ; i--)
		{
			miles = miles + (long)Math.pow(2, count) * arr[i];
			count++;
		}
		System.out.println(miles);
	}

}