I think you see the pattern here. And we're just going to keep going all the way until at some point we're going to keep incrementing our i. i is going to be 49. So it's going to be pi times 49 squared. And then finally, we increment i. i equals becomes 50. And we're going to have plus pi times 50 squared. And then we say, OK, our i is finally equal to this top boundary. And now we can stop.