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

import static java.lang.System.in;

public class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader reader = new BufferedReader(new InputStreamReader(in));
        long N = Long.parseLong(reader.readLine());
        long fizzBuzz = (N / 15);
        long fizz = (N / 3) - fizzBuzz;
        long buzz = (N / 5) - fizzBuzz;

        System.out.println(fizzBuzz * 4 + fizz * 2 + buzz * 2);
    }


}