So this first change in time, this is a change in time of 12 times, so it's going to be 12 times, what's the height? Well v of 12 we knew was 200. v of 12 is 200. So it's going to be 12 times, 12 times 200 plus, okay the height here, or the next interval goes from 12 to 20. So it's going to be eight times. And then the height here is going to be, what is v of 20? I think that was, v of 20 was 240. v of 20 was 240. And then the next interval goes from 20 to 24.