import java.util.Scanner;

public class Input2 {
	public static void main(String[] args) {

		System.out.print("Please click in the Console, ");
		System.out.print("type a number, and press ENTER: ");
		Scanner scanner = new Scanner(System.in);

		if (!scanner.hasNextInt()) {
			System.err.println("unable to read int");
			System.exit(1); //unsuccessful termination
		}
		int i = scanner.nextInt();

		System.out.print("Type another number, and press ENTER: ");

		if (!scanner.hasNextInt()) {
			System.err.println("unable to read int");
			System.exit(1);
		}
		int j = scanner.nextInt();

		scanner.close();
		System.out.println("The sum is " + (i + j) + ".");
		System.exit(0); //successful termination
	}
}