It is known that it takes 4 minutes for a woodworker to saw a piece of wood into 2 sections, how many minutes will it take in total to saw this piece of wood into 4 sections?
已知木工师傅将一根木料锯成2段需要4分钟，若把这根木料锯成4段总共需要多少分钟．
<gadget id="calculator">2 - 1</gadget>
<output>1</output>

<gadget id="calculator">4 / 1</gadget>
<output>4</output>

<gadget id="calculator">4 - 1</gadget>
<output>3</output>

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

<result>12</result>