import java.util.Scanner;
public class MainClass {
static Scanner sc = new Scanner(System.in);
public static void main(String[] args) {
int number = 2;
String input = "Y";
while (input.equalsIgnoreCase("Y")) {
System.out.println(number + " ");
System.out.print("Do you want to keep counting?" + " (Y or N)");
input = sc.next();
number += 2;
}
}
}