import java.util.*;

public class Main {
	public static void main (String[] args) {
		Scanner sc = new Scanner(System.in);
		long n = sc.nextLong();
		int[] counts = new int[401];
		int mod = 365 % 7;
		for (int i = 0; i < 400; i++) {
		    if (mod == 0) {
		        counts[i]++;
		    }
		    int year = i + 2015;
		    if (year % 4 != 0 && year % 100 == 0) {
		        mod += 365;
		    } else {
		        mod += 366;
		    }
		    mod %= 7;
		}
		for (int i = 1; i < 400; i++) {
		    counts[i] += counts[i - 1];
		}
		long times = (n - 2015) / 400;
		int idx = (int)((n - 2015) % 400);
		long ans = times * counts[399] + counts[idx];
		System.out.println(ans);
	}
}