Why? Well, because in the alpha three beta three structure we have a total of three beta structures and each one of these beta structures actually synthesizes a single ATP molecule. And so when this gamma epsilon structure rotates 360 degrees it is able to generate the three ATP molecules. Now, as I mentioned in the beginning, in this searing structure we have anywhere from ten to 14 C subunits and that means anywhere from ten to 14 of these H plus ions can actually move across the searing every time the searing rotates 360 degrees. So 360 degree rotation of the epsilon of the gamma epsilon stock produces three ATP molecules. We multiply that by the range of ten to 14 H plus ions that move across the ATP synthase in a single 360 degree rotation.