Problem:
Score : 100 points

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.

Sample Input 1

20

Sample Output 1

15800

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

Sample Input 2

60

Sample Output 2

47200

Snuke has paid 48000 yen for 60 meals, and the restaurant has paid back 800 yen.

Solution in Python (3.8.2) (judge verdict: Runtime Error)

N = int(input())
x = 800*N
if 15 <= int(N) <30 :
    y = 200
elif  30<= int(N) <45:
    y = 400
elif 45 <= int(N) <60:
    y = 600
elif 60 <= int(N) < 75:
    y = 800
elif 75 <= int(N) < 90:
    y = 1000
elif 90 <= int(N) < 100:
    y = 1200
elif int(N) ==100:
    y = 1200
print(x - y)