This is equal to 3 times 4 is equal to 12. And then we could do it for each of them. And actually, I want to find the total sum. So let me just write it all out, actually. I think that might be an easier thing to do. Because I want to find, for all of these guys combined, the sum of squares due to the differences between the samples. So that's from the first sample, the contribution from the first sample.