import java.util.*;
class Yukico87 {
	public static void main(String[] args) {
		Scanner stdio = new Scanner(System.in);
		
		long n = stdio.nextLong();
		long y = 2015;
		long a = (n-y);
		long ans =0;
		long[] memo = new long[400];
		
		int wed = zeller(23,7,14,20);
		int j =20;
		int k =15;
	
		for(int i=0; i<400; i++) {
			if(wed == zeller(23, 7, k, j)) {
				ans++;
			}
			k++;
			if(k==100) {
				k=0;
				j++;
			}
			memo[i] = ans;
		}
		ans = ans*(a/400);
		a = a%400;
		ans = ans + memo[(int)a];
		System.out.println(ans);
	}
	public static int zeller(int q, int m, int k, int j) {
		return ((q+(((m+1)*26)/10)+k+(k/4)+(j/4) - 2*j)%7);
	}
}