Using 8 numbers from 1-8 to form 4-digit numbers without repeating numbers, how many multiples of 3 can be combined. (Follow-up: What about the five-digit number?)
用1-8这8个数字组成没有重复数字的4位数，一共可以组合成多少个3的倍数的数．(追问：那么五位数呢？)
<gadget id="calculator">2 * 4 * 3 * 2 * 1</gadget>
<output>48</output>

<gadget id="calculator">3 * 3 * 1 * 4 * 3 * 2 * 1</gadget>
<output>216</output>

<gadget id="calculator">48 + 48 + 216 + 216</gadget>
<output>528</output>

<result>528</result>