Calculate with a suitable method: 1+2+3+...+2016+2017+2018.
用合适的方法计算：1+2+3+…+2016+2017+2018．
<gadget id="calculator">1_009 + 1_010</gadget>
<output>2_019</output>

<gadget id="calculator">2_019 * 1_009</gadget>
<output>2_037_171</output>

<result>2_037_171</result>