Use the five numbers 1, 2, 3, 4, and 5 to arbitrarily combine into a two-digit number and a three-digit number, and use a calculator to find their product. So what is the maximum product?
用1，2，3，4，5这5个数字，任意组合成一个两位数和一个三位数，用计算器求出它们的积．那么积最大是多少？
<gadget id="calculator">521 * 43</gadget>
<output>22_403</output>

<result>22_403</result>