<image> <image>

*The two images are equivalent, feel free to use either one.

Input

The input contains a single integer a (-100 ≤ a ≤ 100).

Output

Output the result – an integer number.

Example

Input


1


Output


1
import java.util.Scanner;

public class math
{
	public static void main(String[] args)
	{
		Scanner in = new Scanner(System.in);
		System.out.println((int)(2 - Math.pow(in.nextInt(), 2)));
	}
}
