That doesn't look that great, but anyway. Let's say that this is the probability, this area right here, I don't know how big it really is, we'll figure it out, let's say that this is the probability that someone shares a birthday with at least someone else. What's this area over here? What's this green area? Well, that means if these are all the cases where someone shares a birthday with someone else, these are all the areas where no one shares a birthday with anyone. Or you could say all 30 people have different birthdays. So we're trying to figure out, this is what we're trying to figure out, the probability, I'll just call it the probability that someone shares.