There is a wall clock that rings once every hour, and it is struck a few times at what time. At six o'clock, it takes 5 seconds to strike, then at twelve o'clock, how many seconds are struck.
有一个挂钟，每小时敲一次钟，几点钟就敲几下，六点时，5秒钟敲完，那么十二点时，多少秒钟敲完．
<gadget id="calculator">6 - 1</gadget>
<output>5</output>

<gadget id="calculator">5 / 5</gadget>
<output>1</output>

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

<gadget id="calculator">1 * 11</gadget>
<output>11</output>

<result>11</result>