The shepherd uses 15 fences with a length of 2 meters each to form a square or rectangular sheepfold with one side against the wall. What is the maximum area of the sheepfold in square meters?
牧羊人用15段每段长2米的篱笆，一面靠墙围成一个正方形或长方形羊圈，则羊圈的最大面积是多少平方米．
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

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

<gadget id="calculator">15 - 8</gadget>
<output>7</output>

<gadget id="calculator">7 * 2</gadget>
<output>14</output>

<gadget id="calculator">8 * 14</gadget>
<output>112</output>

<result>112</result>