import java.util.Scanner;
public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		long N = sc.nextLong() - 2014;
		long res = 57 * (N / 400);
		// Zeller
		for (long i = 2015; i <= N % 400 + 2015; i++) if ((39 + 5 * (i % 100) / 4 + 21 * (i / 100) / 4) % 7 == 0) res++;
		System.out.println(res);
	}
}