WeDo 2.0 paper, money and receipt counter

This WeDo 2.0 construction is using a clever mechanism to pull from the front slot, pieces of thin paper of 70mm width maximum (e.g. 5€, 10€ and 20€ paper money or POS receipts are perfect candidates)) and pop it out of the back. At the same time a counter is counting the pieces by whatever amount (+1, +5, etc) you need. The sensor, of course, cannot tell the difference between any pieces of paper. The video is lengthy so I cut out the parts of the code where I change the amount from +20 to +10 to +5 just to see if anyone notices it! Beware!