The experimental primary school teacher training study, from July 13th to August 26th, how many days did you study in total?
实验小学教师培训学习，从7月13日开始到8月26日结束，一共学习了多少天？
<gadget id="calculator">13 - 1</gadget>
<output>12</output>

<gadget id="calculator">31 - 12</gadget>
<output>19</output>

<gadget id="calculator">19 + 26</gadget>
<output>45</output>

<result>45</result>