There is a rectangular iron sheet, 4 meters long and 1 meter wide. How many circular iron sheets with a diameter of 5 decimeters can be cut from this iron sheet at most.
有一块长方形的铁皮，长4米，宽1米．这张铁皮最多能裁出多少个直径为5分米的圆形铁片．
<gadget id="calculator">10 / 5</gadget>
<output>2</output>

<gadget id="calculator">4 * 2 * 1 * 2</gadget>
<output>16</output>

<result>16</result>