Xiao Ming traveled to Hong Kong from March 27 to April 3, how many days did he travel in total?
小明从3月27日到4月3日去香港旅游，他一共旅行了多少天．
<gadget id="calculator">31 - 27</gadget>
<output>4</output>

<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">4 + 1 + 2 + 1</gadget>
<output>8</output>

<result>8</result>