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);
	}
}