So the net reaction of Glycolysis is as follows. We have a glucose. We have two ADPs, two phosphates and two NAD pluses on the reactant side. And we produce the net result are two pyruvates, two ATPs, two Nadhs, two water molecules and two H plus ions. So basically stage one of Glycolysis requires two ATP molecules and we produce our two ADPs. In stage two we take the high energy fructose, one six biphosphate and we break that down into essentially two PGAL and no energy is actually used up or produced.