If a number is added to the least common multiple of 12 and 18, the resulting sum is exactly divisible by 2, 3, and 5 at the same time. What is the smallest number?
一个数加上12和18的最小公倍数，所得的和正好能同时被2、3、5整除，这个数最小是多少．
<gadget id="calculator">2 * 3 * 5</gadget>
<output>30</output>

<gadget id="calculator">30 * 2</gadget>
<output>60</output>

<gadget id="calculator">2 * 2 * 3 * 3</gadget>
<output>36</output>

<gadget id="calculator">60 - 36</gadget>
<output>24</output>

<result>24</result>