For a clock, what time does it strike a few times, five o'clock strikes at 5 o'clock, and it takes 12 seconds to finish the strike. Then how many seconds to knock 12 times at 12 o'clock.
一个时钟，几点钟敲几下，5点钟敲了5下，共用12秒敲完．那么12点钟敲12下多少秒钟敲完．
<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">12 / 4</gadget>
<output>3</output>

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

<gadget id="calculator">3 * 11</gadget>
<output>33</output>

<result>33</result>