Xiaohong went to travel on July 30th and returned on August 4th. How many days did she play in total?
7月30日小红去旅游，8月4日返回，她一共玩了多少天．
<gadget id="calculator">31 - 30</gadget>
<output>1</output>

<gadget id="calculator">1 + 1 + 4</gadget>
<output>6</output>

<result>6</result>