There are some natural numbers that are different and not equal to 0. Their average is 67, and one of them is 81. If 81 is removed, the average of the remaining numbers is 65. So, what is the largest number among these natural numbers?
有一些不相同且不为0的自然数，它们的平均数是67，其中一个数是81，若去掉81，则剩下几个数的平均数是65．那么，这些自然数中最大的数是多少．
<gadget id="calculator">65 * 7</gadget>
<output>455</output>

<gadget id="calculator">455 - 1 - 2 - 3 - 4 - 5 - 6</gadget>
<output>434</output>

<result>434</result>