import java.util.Scanner;

class No_311 {
	public static void main(String args[]) {
		Scanner stdIn = new Scanner(System.in);		
		int num = stdIn.nextInt();

		int count = 0;
		int i = 1;
		for (Integer.toUnsignedLong(i); i <= Integer.toUnsignedLong(num); i++) {
			if ((i % 3 == 0) && (i % 5 == 0)) {
				count += 4;
			}
			else if (i % 3 == 0 || i % 5 == 0) {
				count += 2;
			}
		}
		System.out.println(count);
	}
}