Choose three numbers from 0, 2, 4, and 6 to form a three-digit number that is a multiple of 3. How many such three-digit numbers can be formed?
从0、2、4、6中选出三个数字，组成一个是3的倍数的三位数．一共可以组成多少个这样的三位数．
<gadget id="calculator">3 * 2 * 1</gadget>
<output>6</output>

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

<gadget id="calculator">6 + 4</gadget>
<output>10</output>

<result>10</result>