ribbon is 24 meters, every 4 meters (cut a single piece each time), how many times to cut in total.
一根彩带24米，每4米一段(每次剪单根)，一共剪多少次．
<gadget id="calculator">24 / 4</gadget>
<output>6</output>

<gadget id="calculator">6 - 1</gadget>
<output>5</output>

<result>5</result>