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

(defun read-integers ()
  (let ((input (read-line)))
    (mapcar #'parse-integer (split-sequence-from-string input))))

(defun split-sequence-from-string (str)
  (let ((start 0)
        (len (length str))
        (result '()))
    (loop for i from 0 to len
          when (or (eql i len) (char= (char str i) #\Space))
          do (when (> i start)
               (push (subseq str start i) result))
             (setf start (1+ i)))
    (nreverse result)))

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

(main)