The school starts summer vacation from July 12th to August 28th. How many days are there in total?
学校从7月12日开始放暑假到8月28日开学，暑假一共放了多少天？
<gadget id="calculator">31 - 12</gadget>
<output>19</output>

<gadget id="calculator">19 + 1 + 28</gadget>
<output>48</output>

<result>48</result>