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: Runtime Error)

package atcoder;

import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);
		// 回数
		int n = in.nextInt();
		// 今までに払った金額
		int x = 800;
		// レストランからもらう金額
		int y = 200;
		// answer
		int ans = 0;
		if (n < 15) {
			System.out.println(x * n);
		} else if (n == 15) {
			System.out.println(x * n - y);
		} else if (15 < n) {
//			if (n % 15 == 0) {
				System.out.println(x * n - (y * (n / 15)));
//			}else {
//				System.out.println(x * n - (y * (n / 15)));
//			}

		}
	}
}