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:
Print the answer.
So far, Snuke has paid $16000$ yen, and the restaurant has paid back $200$ yen. Thus, the answer is $15800$.
Snuke has paid $48000$ yen for $60$ meals, and the restaurant has paid back $800$ yen.