import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		long n = sc.nextLong();
		String temp ="";
		long count = 0;
		for (int i = 1; i <= n; i++) {
			if (i % 3 == 0 && i % 5 ==0) {
				temp += "FizzBuzz";
			} else if (i % 3 == 0) {
				temp += "Fizz";
			}else if (i % 5 == 0) {
				temp +="Buzz";
			}
		}
		for (int i = 0; i < temp.length(); i++){
			if (temp.substring(i , i+1).equals("z")){
				count++;
			}
		}
		System.out.println(count);
		sc.close();
	}
}