Problem Statement

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 $x-y$.

Constraints

• $1 ≤ N ≤ 100$

Input

The input is given from Standard Input in the following format:

N

Output

Print the answer.