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());

			long FizzBuzz = (n / 15);
			long Fizz = (n / 3) - FizzBuzz; 
			long Buzz = (n / 5) - FizzBuzz;
			long cnt = FizzBuzz * 4 + Fizz * 2 + Buzz *2;
			System.out.println(cnt);
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

}