The summer vacation this year starts from July 12th and ends on August 23rd. How many days are there in total?
今年暑假从7月12日开始，到8月23日开学，假期共有多少天．
<gadget id="calculator">31 - 12</gadget>
<output>19</output>

<gadget id="calculator">19 + 1</gadget>
<output>20</output>

<gadget id="calculator">20 + 23</gadget>
<output>43</output>

<result>43</result>