It's equal to 100%. So if we figure out the probability that everyone has the same birthday, we could subtract it from 100. So let's see, if we could just rewrite this. The probability that someone shares a birthday with someone else, that's equal to 100% minus the probability that everyone has distinct separate birthdays. And the reason why I'm doing that is because, as I started off in the video, this is kind of hard to figure out. I could figure out the probability that two people have the same birthday, five people, and it becomes very confusing. But here, if I want to just figure out the probability that everyone has a distinct birthday, it's actually a much easier probability to solve for.