Well, and just to clarify, if I take 0 left steps, that means I must have taken 10 right steps. And I calculate this probability, and I should have drawn maybe a line here. I calculate this using the binomial distribution. And how do I do that? I say, what is the probability that I take a total of 10 steps, so let me actually switch colors just to make things interesting. Let's see, do they have a purple here? I'll do a blue.