There are five different numbers, the mean and median are 15 and 18 respectively, what is the maximum value of the largest number among them?
有五个互不相同的数，平均数和中位数分别为15和18，其中最大数的最大值是多少．
<gadget id="calculator">15 * 5</gadget>
<output>75</output>

<gadget id="calculator">75 - 1 - 2 - 18 - 19</gadget>
<output>35</output>

<result>35</result>