Subtract (1/5) continuously from 1, how many times you subtract to get 0.
从1里面连续减去(1/5)，减去多少次得0．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 / (1/5)</gadget>
<output>5</output>

<result>5</result>