But so for two of them, we have to multiply by 2. So plus 2 times 6 times h. And then we have these two side panels. We have this side panel right over here. And we have this side panel right over here. The area of each of them is going to be 2x times h. So it's going to be 2x times h. The cost of the material is going to be 6. So the cost of one of the panels is going to be $6 per square meters times 2xh meters squared. But we have two of these panels, one panel and two panels.