So let's take a look at glycine. So glycine contains the h atom sidechain group, and that means it is not ionizable. Now, at some specific temperature value, the PKA of this particular alpha amino group is 8.0. And for this particular alpha carboxyl group, let's say it's 3.1 at that same temperature condition. So in this particular case, all we have to do to find the pi value of this amino acid is simply take the sum of these, divide by two and we get the average. So we have eight plus 3.1, which is 11.1.