And you're summing each of these terms as you go. And you go all the way until i is equal to 10. All the way until i is equal to 10. 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.