(unless (member :child-sbcl *features*)
  (quit
   :recklessly-p t
   :unix-status
   (process-exit-code
    (run-program *runtime-pathname*
                 `("--control-stack-size" "256MB"
                   "--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 fact (n)
  (if (= n 0)
      1
      (mod (* n (fact (- n 1))) 1000000007)))

(defun main ()
  (let ((n (read)))
    (format t "~d~%" (fact n))))

(main)