10-meter-long piece of wood is cut every 2 meters, how many times does it need to be sawed.
一根10米长的木料，每2米锯一段，需要锯多少次．
<gadget id="calculator">10 / 2</gadget>
<output>5</output>

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

<result>4</result>