import java.util.Scanner;


public class prog {
    public static void main (String[] args) throws java.lang.Exception
    {
        Scanner scanner = new Scanner(System.in);
        Integer n = Integer.parseInt(scanner.nextLine());
        int res = 1;
        for (int i = 2; i < n; i++) {
            res = (res * i) % n;
        }
        System.out.println(res);
        scanner.close();
    }
}