(defun main (&rest argv)
  (declare (ignorable argv))
  (let* ((n (read))
         (m n)
         (pf 0)
         (p 2))
    (loop while (<= (* p p) m)
          do (loop while (zerop (mod n p))
                   do (incf pf)
                      (setf n (floor n p)))
             (incf p))
    (unless (= n 1)
            (incf pf))
    (format t "~a~%" (if (>= pf 3) "YES" "NO"))))

(main)