What is it with potato cakes. You go into the fish and chip shop and you order n potato cakes
n = the number of potato cakes you want
and inevitable you end up getting n + 1 potato cakes
number of potato cakes you actually get = n + 1
So next time you go to the same fish and chip shop you think, "Hay, I'll be smart, I only want n potato cake, so I'll order n - 1, knowing I'll get n + 1 potato cakes
being smart, next visit you order = n - 1 potato cakes
Then the man gives you bloody n - 1 potato cakes and you are now one short!
Arrrrrrrrrr, you just can't win can you?!?!?