#-swank
(unless (member :child-sbcl *features*)
  (quit
   :recklessly-p t
   :unix-status
   (process-exit-code
    (run-program *runtime-pathname*
                 `("--control-stack-size" "1024MB"
                   "--noinform" "--disable-ldb" "--lose-on-corruption" "--end-runtime-options"
                   "--eval" "(push :child-sbcl *features*)"
                   "--script" ,(namestring *load-pathname*))
                 :output t :error t :input t))))

(defun solve-game ()
  (let* ((n (read))
         (a (loop for i from 1 to n collect (read))))
    (if (or (eq 0 (apply 'min a)) (eq 1 (apply 'min a)))
      (format t "Yes~%")
      (format t "No~%"))))

(solve-game)