If there is a wire, it takes 2 minutes to cut it into 2 pieces, how many minutes will it take to cut it into 5 pieces?
有一根电线，把它截成2段需要2分钟，那么要截成5段需要多少分钟．
<gadget id="calculator">2 - 1</gadget>
<output>1</output>

<gadget id="calculator">2 / 1</gadget>
<output>2</output>

<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">2 * 4</gadget>
<output>8</output>

<result>8</result>