A rectangle is surrounded by 28-meter-long iron wire (adjacent sides are rounded to integers), what is the maximum area of this rectangle?
用长28米的铁丝围成一个长方形(相邻的边取整数)，这个长方形最大面积是多少．
<gadget id="calculator">6 * 8</gadget>
<output>48</output>

<result>48</result>