986 first subtract 100, then add 99, then subtract 100, add 99...and so on, after subtracting how many 100, the result is 0.
986先减100，再加上99，再减100，再加上99…如此下去，减多少个100后结果为0．
<gadget id="calculator">100 - 99</gadget>
<output>1</output>

<gadget id="calculator">986 / 1</gadget>
<output>986</output>

<result>986</result>