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 counter = 0;
        for (long i = 3; i <= N; i++) {
            if (i % 15 == 0) {
                counter += 4;
            } else if (i % 5 == 0) {
                counter += 2;
            } else if (i % 3 == 0) {
                counter += 2;
            }
        }
        System.out.println(counter);
    }


}