Calculation: (200+198+196+...+2)-(1+3+5+...+199)=how much.
计算：(200+198+196+…+2)-(1+3+5+…+199)=多少．
<gadget id="calculator">202 * 50</gadget>
<output>10_100</output>

<gadget id="calculator">200 * 50</gadget>
<output>10_000</output>

<gadget id="calculator">10_100 - 10_000</gadget>
<output>100</output>

<result>100</result>