import java.util.Scanner;

public class No_311 {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		long endNum = sc.nextLong();
		String fb = "";
		
		for(int i = 1;i <= endNum;i++){
			if(i%15 == 0){
				fb += "Fizzbuzz";
			}
			else if(i%5 == 0){
				fb += "Buzz";
			}
			else if(i%3 == 0){
				fb += "Fizz";
			}
			else{
				fb += String.valueOf(i);
			}
		}
		char[] pieceOf_fb = fb.toCharArray();
		long z_count = 0;
		for(int i = 0;i < pieceOf_fb.length;i++){
			char c = pieceOf_fb[i];
			if(c == 'z'){
				z_count++;
			}
		}
		System.out.println(z_count);
		sc.close();

	}

}