125*how much/2*8-1=1999.
125*多少/2*8-1=1999．
<gadget id="calculator">1_999 + 1</gadget>
<output>2_000</output>

<gadget id="calculator">2_000 / 8</gadget>
<output>250</output>

<gadget id="calculator">2 / 125</gadget>
<output>2/125 = around 0.016</output>

<gadget id="calculator">250 * (2/125)</gadget>
<output>4</output>

<result>4</result>