#-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 (sort (loop for i from 1 to n collect (read)) #'>)))
    ;; aの最小値が0または1ならが0または1ならYes,そうでなければNoを出力
    (if (or (zerop (first a)) (zerop (first (rest a)))) "Yes" "No")))

(solve-game)