And so if you look here, this says, OK, what is the probability that I take 0 steps? So I take a total of 10 steps, just to understand the spreadsheet. So if I take a total of 10 steps, what is the probability that I take 0 left steps? 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?