Well, this is just going to get us six. All right, last but not least, if we are going from four to six of f of x dx, so that's going to be this area right over here. But we have to be careful. Our function is below the x-axis. So we'll figure out this area, and then it's going to be negative. So this is a half of a circle of radius one. And so the area of a circle is pi times r squared, so it's pi times one squared.