So pi times, and so this is just y is equal to x. And then we're going to multiply it times the depth, times the depth of each of these disks. And each of these disks are going to have a depth of dx. If you imagine a quarter that has an infinitely thin depth right over here, so it's going to be dx. And so the volume of our truffle with the cone carved out is going to be this integral minus this integral right over here. And we could evaluate it just like that, or we could even say, OK, we could factor out a pi out of both of them. Actually, there's multiple ways that we could write it, but let's just evaluate it like this, and then I'll generalize it in the next video.