Calculation: 1+2+3+4+5+...+1000.
计算：1+2+3+4+5+…+1000．
<gadget id="calculator">1 + 1_000</gadget>
<output>1_001</output>

<gadget id="calculator">1_000 / 2</gadget>
<output>500</output>

<gadget id="calculator">1_001 * 500</gadget>
<output>500_500</output>

<result>500_500</result>