How many different three-digit numbers without repeating numbers can be formed with the numbers 0, 1, 3, and 5.
用数字0、1、3、5可以组成多少个不同的没有重复数字的三位数．
<gadget id="calculator">3 * 3 * 2</gadget>
<output>18</output>

<result>18</result>