And if the slope is zero where the graph looks like that, we see that that is a local minimum. That is a local minimum. And so we definitely don't want to do this. We would produce 472 and a half units if we were looking to minimize our profit, maximize our loss. So we definitely don't want to do this. But let's actually think about what our profit is going to be if we produce 3.528 thousands of shoes, or 3,528 shoes. Well, to do that, we just have to input it back into our original profit function right over here.