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 Java8 (OpenJDK 1.8.0) (judge verdict: Accepted)

import java.io.IOException;
import java.util.ArrayList;
import java.util.Scanner;

class Main {
	public static void main(String args[]) throws IOException {
		@SuppressWarnings("resource")
		Scanner cin = new Scanner(System.in);
		ArrayList<String> inLines = new ArrayList<String>();
		for (; cin.hasNext();) {
			inLines.add(cin.nextLine());
		}
		Solver solver = new Solver();
		solver.solve(inLines);
	}
}

class Solver {

	public void solve(ArrayList<String> inLines) {
		int N = Integer.parseInt(inLines.get(0));
		int ans = N * 800 - ((N / 15) * 200);
		System.out.println(ans);
	}
}