import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main{
	public static void main(String[] args) {
		try (BufferedReader br = new BufferedReader(new InputStreamReader(System.in))) {
			long n = Long.parseLong(br.readLine());
			char[] arr = FizzBuzz(n).toCharArray();
			long cnt = 0;
			
			for (char c : arr) {
				if (c == 'z') {
					cnt++;
				}
			}

			System.out.println(cnt);
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

	public static String FizzBuzz(long n) {
		StringBuilder sb = new StringBuilder();

		for (long i = 1; i < n + 1; i++) {
			if (i % 15 == 0) {
				sb.append("FizzBuzz");
			} else if (i % 3 == 0) {
				sb.append("Fizz");
			} else if (i % 5 == 0) {
				sb.append("Buzz");
			} else {
				sb.append(i);
			}
		}

		return sb.toString();
	}
}