Score : 100 points
Snuke has a favorite restaurant.
The price of any meal served at the restaurant is 800 yen (the currency of Japan), and each time a customer orders 15 meals, the restaurant pays 200 yen back to the customer.
So far, Snuke has ordered N meals at the restaurant. Let the amount of money Snuke has paid to the restaurant be x yen, and let the amount of money the restaurant has paid back to Snuke be y yen. Find x-y.
The input is given from Standard Input in the following format:
N
Print the answer.
20
15800
So far, Snuke has paid 16000 yen, and the restaurant has paid back 200 yen. Thus, the answer is 15800.
60
47200
Snuke has paid 48000 yen for 60 meals, and the restaurant has paid back 800 yen.