There are 4 cylinders of wood, each of which is sawn into 3 equal sections, and the sawing fee is 2 yuan for each section, and how much is the sawing fee for sawing all of them.
有4根圆柱体木料，每根都锯成相等的3段，每锯开一处需付锯板费2元，全部锯完需付锯板费多少元．
<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">2 * 2 * 4</gadget>
<output>16</output>

<result>16</result>