Chocolate cost is Rs.1 and if we return 3 wrappers (covers) of chocolate we get 1 more chocolate. If you have Rs.15 how many chocolates do you get ?

I have Rs.15 = 15 Chocolates + 15 wrappers(covers)
Give 15 wrappers = we will get 5 chocolates + 5 wrappers
Give only 3 wrappers = we will get 1 chocolate + 1 wrapper
Give remaining 2 wrappers along with new 1 wrapper = we will get 1 more chocolate
so total = 15 + 5 + 1 + 1= 22