When do CPPQuiz Questions end

Hello everyone, I am working my way through these questions. I am wondering at which question number there are no more questions. I think the questions end around 400. But you can even do "https://cppquiz.org/quiz/question/1999", and theres no 404 error. it just says question missing. I was wondering what might be a simple way to figure this out. Chatgpt isnt of much help.