import java.util.Scanner;

public class Yukicoder87 {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		long N = sc.nextLong() - 2014;
		long res = 57 * (N / 400);
		N = N % 400;
		// ツェラーの公式
		for (long i = 2015; i <= N + 2015; i++)
			if ((23 + (int) (26 * 8 / 10) + (i % 100) + (long) ((i % 100) / 4) + 5 * (long) (i / 100) + (long) (i / 100) / 4) % 7 == 4)
				res++;
		System.out.println(res);
	}
}