(defun is-perfect-number (n)
  (let ((sum 1))
    (loop for i from 2 to (isqrt n) do
      (when (zerop (mod n i))
        (incf sum i)
        (unless (= i (/ n i))
          (incf sum (/ n i)))))
    (= sum n)))

(defun main ()
  (let ((n (read)))
    (if (is-perfect-number n)
        (format t "Yes~%")
        (format t "No~%"))))

(main)