Xingfu Road Primary School will be on vacation from January 18th, and the new semester will start on February 19th. How many days are there in total for the winter vacation?
幸福路小学从1月18日开始放假，2月19日新学期开学上课，寒假一共有多少天．
<gadget id="calculator">31 - 18</gadget>
<output>13</output>

<gadget id="calculator">13 + 1 + 18</gadget>
<output>32</output>

<result>32</result>