import java.util.Scanner;

public class WhichSystem {
	/* This application will help you determine
	 * how much memory you need on the current
	 * machine to do the task you report you
	 * want to do.
	 * The specifics are in the project description
	 * file posted on the class web site.
	 */
	public static void main(String[] args)
	{
		Scanner scan = new Scanner (System.in);
		int users;
		System.out.println("Users?");
		users = scan.nextInt();
		String system;

		if (users < 1)
			System.out.println ("None needed");
		if (users >= 50)
			System.out.println ("Impossible");
		else
			System.out.println("System?");
			system = scan.next();

	}
}