Well, that's just the probability weighted sum of the values that this could take on. So there is a 1 minus p probability that we get failure, that we get 0. So there's 1 minus p probability of getting 0, so times 0. And then there is a p probability of getting 1, plus p times 1. Well, this is pretty easy to calculate. 0 times anything is 0, so that cancels out. And then p times 1 is just going to be p. So pretty straightforward.