It takes 6 seconds from the first ring to the fourth ring of the wall clock, how many seconds will it take from the first ring to the twelfth ring?
挂钟从第一下响起到第四下响起经过6秒，从第一下响起到第十二下响起要经过多少秒．
<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<gadget id="calculator">6 / 3</gadget>
<output>2</output>

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

<gadget id="calculator">2 * 11</gadget>
<output>22</output>

<result>22</result>