import java.io.*;
import java.util.*;

class ClassX {
	public void processFile(String fname)
			throws FileNotFoundException, InputMismatchException, NegativeIntegerException {
		Scanner inFile = new Scanner(new File(fname));
		int x = inFile.nextInt();
		inFile.close();
		if (x < 0)
			throw new NegativeIntegerException();
		System.out.println("Data is: " + x);
	}
}

class ClassY {
	public void processFile(String fname) throws FileNotFoundException {
		Scanner inFile = new Scanner(new File(fname));
		int x = inFile.nextInt();
		inFile.close();
		System.out.println("Data is: " + x);
	}
}

class ClassZ extends ClassX { // ClassY
	public void processFile(String fname) throws FileNotFoundException, NegativeIntegerException {
		Scanner inFile = new Scanner(new File(fname));
		int x = inFile.nextInt();
		inFile.close();
		if (x < 0)
			throw new NegativeIntegerException();
		System.out.println("Data is: " + x);
	}
}

public class Main {

	public static void main(String[] args) {

		try {
			ClassZ p = new ClassZ();
			p.processFile("1.txt");
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (NegativeIntegerException e) {
			e.printStackTrace();
		}
	}
}