Subtract 25 from 100, add 22, then subtract 25, add 22, ... such continuous calculation, the result is zero, how many 25 should be subtracted in total.
从100里减25，再加上22，再减25，再加上22，…这样连续计算，得数为零，一共要减多少个25．
<gadget id="calculator">100 - 25</gadget>
<output>75</output>

<gadget id="calculator">25 - 22</gadget>
<output>3</output>

<gadget id="calculator">75 / 3</gadget>
<output>25</output>

<gadget id="calculator">25 + 1</gadget>
<output>26</output>

<result>26</result>