There are 5 integers lined up, the small ones go to the left, and the big ones go to the right. It is found that the median is 4, and the mode of this set of data is only 6. What is the maximum sum of these 5 numbers?
有5个整数排队，小的向左排，大的向右排，发现中位数是4，这组数据的众数只有6，则这5个数的和最大是多少
<gadget id="calculator">2 + 3 + 4 + 6 + 6</gadget>
<output>21</output>

<result>21</result>