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.

-----Sample Input-----
20

-----Sample Output-----
15800

So far, Snuke has paid 16000 yen, and the restaurant has paid back 200 yen. Thus, the answer is 15800.

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