Buying Sweets

Banknotes in the state of Strangeland don't have any regulated values like 1, 5, 10, 20, 50, 100, etc. In fact, it's possible to see any positive integer on a banknote of Strangeland. Indeed, this isn't the most convenient thing. Ann is working as a sweet seller at a shop in Strangeland. Every kind of sweets in this shop has its own cost, and sweets of the same kind have the same cost. Customers