The length of the box is 20 cm, the width is 4 cm, and the height is 1 cm. A cylindrical part has a base diameter of 2 cm and a height of 1 cm. What is the maximum number of parts that can be placed in this box.
包装盒的长是20厘米，宽是4厘米，高是1厘米．圆柱形零件的底面直径是2厘米，高是1厘米．这个包装盒内最多能放多少个零件．
<gadget id="calculator">20 / 2</gadget>
<output>10</output>

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

<gadget id="calculator">10 * 2 * 1</gadget>
<output>20</output>

<result>20</result>