Let's see if g, if we're actually, if we're actually switching signs or not. So let me draw a number line here. And so this is, so this is two, three, four, five, and I could keep going. And so we know that something interesting is happening right over here. G prime prime of four is equal to zero. G prime prime of four is equal to zero. So let's think about what the second derivative is when we are less than four.