How many three-digit numbers can be formed from the numbers 1, 2, 3, 4, 5, 6, 7, and 8? (use each number only once)
由数字1、2、3、4、5、6、7、8可组成多少个三位数．(每个数字只用一次)
<gadget id="calculator">8 * 7 * 6</gadget>
<output>336</output>

<result>336</result>