/**
 * COSC 1010 Exception Demo.
 * @author Dennis Brylow
 * @version 1.0,    2010 Nov 15
 */
import java.util.Scanner;

public class ExcpTest
{
	public static void main(String[] args) throws Exception
	{
		Scanner keyboard = new Scanner(System.in);
		int x = 0;

		try {
			x = keyboard.nextInt();
		}
		catch (java.util.InputMismatchException ime)
		{
			System.err.println("Got something that wasn't a number!");
			System.err.println("Exception was: " + ime);
			x = -1;
		}
		catch (java.util.NoSuchElementException nsee)
		{
			System.err.println("No input!");
			x = -2; 
		}
		catch (Exception e)
		{
			System.err.println("Unknown problem! " + e);
		}


		if (x == 13)
		{
			throw new Exception("Entered 13.  That is forbidden.");
		}

		System.out.println(x);
		
	}
}