<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.io.PrintWriter;
import java.util.Arrays;
import java.util.List;
import java.util.Scanner;

public class MAth {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        PrintWriter pw = new PrintWriter(System.out);

        int num = sc.nextInt();
        int sol = 2 - num*num;
        pw.println(sol);
        pw.flush();
    }
}
