In a rectangle with a length of 8 cm and a width of 4 cm, how many circles with a radius of 1 cm can be drawn at most.
在一个长是8cm，宽4cm的长方形中，最多可画多少个半径是1cm的圆．
<gadget id="calculator">2 * 4</gadget>
<output>8</output>

<result>8</result>