From June 25th (including this day) to July 12th (including this day), how many days are there?
从6月25日开始(包括这一天)到7月12日(包括这一天)，共有多少天？
<gadget id="calculator">30 - 25</gadget>
<output>5</output>

<gadget id="calculator">12 - 1</gadget>
<output>11</output>

<gadget id="calculator">5 + 1 + 11 + 1</gadget>
<output>18</output>

<result>18</result>