With $15 you got 15:1 = 15 candies
With 15 candies, you can exchange with the wrapper 15 :3 = 5 candies
With 5 candies, you can exchange 1 candies and you still got 2 wrapper
And the last,you get 1 wrapper + 2 last wrapper,you can get 1 candy again
Thats 15+5+1+1 = 22 candies total
