The perimeter of a rectangle is 50 decimeters, the number of decimeters in length is a prime number, and the width is a composite number. What is the maximum area of a rectangle that satisfies the above conditions?
一个长方形的周长是50分米，其中长的分米数是一个质数，宽是一个合数，满足上述条件的长方形的最大面积是多少平方分米．
<gadget id="calculator">12 * 13</gadget>
<output>156</output>

<result>156</result>