So the MCA les constant Km is equal to so K minus one plus K two divided by K one. And because K minus one this quantity is much greater than K two. For example, let's say if this is 1 million and this is one, then 1 million plus one doesn't really change the value of K minus one by too much. And so what that means is we can approximate this to equal to this. So because this is much smaller than this, this sum is approximately equal to simply K minus one. So our numerator is replaced by K minus one.