So given what I just told you, I encourage you to pause this video and write the sigma notation for this sum right over here. Assuming you've given a go at it, well, this would be the sum. The first term, well, it might be easy to just say, we'll start at i equals 1 again. i equals 1. But now we're not going to stop until i equals 100. And we're going to sum up all of the i's. Let's do another example.