And we did that in the last video, if you're getting confused. And we also said that there's going to be exactly k terms here. So if you counted these, there's 1, 2, 3, all the way there's going to be k terms here. And so we took care of that, we just rewrote that. And I said I would switch these two things around. So that's divided by n to the k times lambda to the k over k factorial. And then what do we have here?