Subtract 100 from 1000, add 50, then subtract 100, add 50... In this way, how many times will the result be 0.
从1000里减去100，加上50，再减去100，再加上50…这样算下去，要运算多少次后结果才是0．
<gadget id="calculator">1_000 - 50</gadget>
<output>950</output>

<gadget id="calculator">100 - 50</gadget>
<output>50</output>

<gadget id="calculator">950 / 50</gadget>
<output>19</output>

<gadget id="calculator">19 * 2</gadget>
<output>38</output>

<gadget id="calculator">38 - 1</gadget>
<output>37</output>

<result>37</result>