And in step nine we produce a single H 20. Now this only shows one PGAL reacting, but in stage two we produce two. So that means stage three takes place twice and we form two nadhs, we form four ATPs and we form two H 20 molecules. So now let's count up all the reactants and all our products. So the reactants are basically the glucose. So we also have two ATP molecules, one and two that have to be utilized.