(defun main (&rest argv)
  (declare (ignorable argv))
  (let* ((n (read))
         (res 0))
    (loop for i from 1 to n do
          (let ((c 0))
            (loop for j from 1 to n
                  when (zerop (mod i j))
                    do (incf c))
            (when (= c 2)
                  (incf res i))))
    (format t "~d~%" res)))

(main)