import java.util.Scanner;

public class Yukicoder87 {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int res = 0;
		// ツェラーの公式
		for (int i = 2015; i <= N; i++)
			if ((23 + (int) (26 * 8 / 10) + (i % 100) + (int) ((i % 100) / 4) + 5 * (int) (i / 100) + (int) (i / 100) / 4) % 7 == 4) res++;
		System.out.println(res);
	}
}