So this right over here, what would this height be? Well, this height, this value, I should say, this is going to be equal to f of what? Well, this was pi, and this is going to be pi plus the length of our interval right over here, the base of the rectangle. So we started at pi, so it's going to be pi plus, this one's going to be pi over n, I could say, times one. That's this height right over here. What's this one going to be right over here? Well, this one is going to be f of pi, our first start, plus pi over n times what?