So we have to take that into account when we actually sum up our results. So how many ATP molecules are generated when 31 of these nadhs are actually oxidized along the electron transport chain? So we have 31 NADH molecules multiplied by 2.5 ATP per NADH molecule. That gives us 77.5 ATP molecules. Now, 15 multiplied by 1.5 gives us 22.58 multiplied by one because we have a one to one conversion from GTP to ATP, that gives us eight. And we also use up two ATP molecules during the activation process, so we have to subtract the two.