So just like that. And so then our right Riemann approximation using our right Riemann sum with three equal subdivisions to approximate the area, we would just add the area of these rectangles. So this first rectangle, let's see, it is three wide. And how high is it? Well, the height here is f of four, which is eight. So this is going to be 24 square units, whatever the units happen to be. This is going to be three times, the height here is three, f of seven is three.