Divide 16 into the sum of several natural numbers, and the product of these natural numbers is required to be as large as possible. What is the largest product?
把16拆成若干个自然数之和，要求这些自然数的乘积尽量大，最大的积是多少．
<gadget id="calculator">3 * 3 * 3 * 3 * 2 * 2</gadget>
<output>324</output>

<result>324</result>