125 can be divisible by 2, 3, and 5 at the same time.
125至少加上多少就同时能被2、3、5整除．
<gadget id="calculator">2 * 3 * 5</gadget>
<output>30</output>

<gadget id="calculator">30 * 5</gadget>
<output>150</output>

<gadget id="calculator">150 - 125</gadget>
<output>25</output>

<result>25</result>