import java.math.BigInteger;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        BigInteger N = new BigInteger(sc.next());

        String fizzbuzz = fizzBuzzString(N);
        
        int cnt = 0;
        for (int i = 0; i < fizzbuzz.length(); i++) {
            if (fizzbuzz.charAt(i) == 'z') cnt++;
        }
        
        System.out.println(cnt);
    }

    private static String fizzBuzzString(BigInteger n) {
        StringBuilder result = new StringBuilder();
        for (BigInteger i = BigInteger.ONE; i.compareTo(n) <= 0; i = i.add(BigInteger.ONE)) {
            if (i.mod(new BigInteger("15")).compareTo(BigInteger.ZERO) == 0) {
                result.append("FizzBuzz");
            } else if (i.mod(new BigInteger("3")).compareTo(BigInteger.ZERO) == 0) {
                result.append("Fizz");
            } else if (i.mod(new BigInteger("5")).compareTo(BigInteger.ZERO) == 0) {
                result.append("Buzz");
            } else {
                result.append(i.toString());
            }
        }

        return result.toString();
    }
}