(defun is-mersenne-prime (p)
  (let ((mp (1- (expt 2 p))))
    (loop for i from 2 to (isqrt mp) never (zerop (mod mp i)))))

(defun generate-perfect-numbers (limit)
  (let ((perfect-numbers '()))
    (loop for p from 2 do
      (when (is-mersenne-prime p)
        (let ((perfect-num (* (1- (expt 2 p)) (expt 2 (1- p)))))
          (when (> limit perfect-num)
            (push perfect-num perfect-numbers)
            (format t "Generated perfect number: ~A~%" perfect-num)))))
    perfect-numbers))

(defun main ()
  (let ((limit (read)))
    (if (some (lambda (x) (= x limit)) (generate-perfect-numbers limit))
        (format t "Yes~%")
        (format t "No~%"))))

(main)