The Ruijin Red Tourism Culture Festival started on October 30th and lasted until November 2nd. How many days did the event last?
瑞金红色旅游文化节从10月30日开始，持续到11月2日，活动进行了多少天．
<gadget id="calculator">2 + 2</gadget>
<output>4</output>

<result>4</result>