Calculate how much 100*99-98*97+96*95-94*93+...+4*3-2*1=.
计算100*99-98*97+96*95-94*93+…+4*3-2*1=多少．
<gadget id="calculator">198 + 6</gadget>
<output>204</output>

<gadget id="calculator">33 / 2</gadget>
<output>33/2 = around 16.5</output>

<gadget id="calculator">204 * (33/2) * 2</gadget>
<output>6_732</output>

<gadget id="calculator">6_732 - 2_550</gadget>
<output>4_182</output>

<result>4_182</result>