There are three wooden sticks, and it is planned to saw each stick into 3 sections. It takes three minutes to saw each stick, and how many minutes will it take to saw all of them.
有三根木棒，打算把每根锯成3段，每根锯开一处需要三分钟，全部锯完需要多少分钟．
<gadget id="calculator">3 - 1</gadget>
<output>2</output>

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

<gadget id="calculator">6 * 3</gadget>
<output>18</output>

<result>18</result>