import java.util.Scanner;

public class testClass
{
	public static void main (String[] args)
	{
		int num1 = (int) (Math.random() * (500));
		int num2 = (int) (Math.random() * (500));

		System.out.println("What's "+num1+" + "+num2+"?");

		while(true)
		{
			Scanner scan = new Scanner(System.in);
			int input = scan.nextInt();

			if (input==(num1+num2))
			{
				System.out.print("Correct answer!");
				break;
			}
		}
	}
}