So 24 plus seven, that gives us 31 NADH molecules and we also have the eight GTPs. Now recall in our discussion on the activation of fatty acids, we said that two ATP molecules are actually used up when we transform palmitic acid into its activated form, palmitoyle coenzyme A. So we also actually use up two ATP molecules when we activate the fatty acid. 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.