We use two ATP molecules in stage one. And the net result is we form two ATP molecules in glycolysis per glucose that we actually use up. So if we sum all these individual reactions and we basically sum up all these individual energy values, keeping in mind that all these take place twice. And so we have to multiply, multiply these energy values by two for these five steps, we basically get the following net results. So we have a glucose, we have two ADP, we have two NAD, plus we have two PiS. That's our net input.