From a rectangular piece of paper with a length of 20 cm and a width of 5 cm, how many small circles with a diameter of 5 cm can be cut at most.
在一张长20厘米，宽5厘米的长方形纸片中，最多可以剪多少个直径是5cm的小圆形．
<gadget id="calculator">20 / 5</gadget>
<output>4</output>

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

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

<result>4</result>