Draw a circle with a diameter of 4 cm inside a rectangle with a length of 16 cm and a width of 8 cm. How many such circles can be drawn at most?
在一张长16厘米，宽8厘米的长方形内画直径是4厘米的圆，这样的圆最多可画多少个．
<gadget id="calculator">16 / 4</gadget>
<output>4</output>

<gadget id="calculator">8 / 4</gadget>
<output>2</output>

<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<result>8</result>