If it takes 2 points to saw a piece of wood into two pieces, how many points will it take to saw it into five pieces?
把一根木料锯成两段需要2分，那么锯成5段需要多少分．
<gadget id="calculator">5 - 1</gadget>
<output>4</output>

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

<result>8</result>