<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 F {
    Scanner sc = new Scanner(System.in);

    public void run() {
        int n = sc.nextInt();
        System.out.println(2 - n * n);
    }

    public static void main(String[] args) {
        F sol = new F();
        sol.run();
    }
}
