Calculation: (2+4+6+8+10+...+1440)*2.
计算：(2+4+6+8+10+…+1440)*2．
<gadget id="calculator">2 + 1_440</gadget>
<output>1_442</output>

<gadget id="calculator">1_440 / 2</gadget>
<output>720</output>

<gadget id="calculator">720 / 2</gadget>
<output>360</output>

<gadget id="calculator">1_442 * 360 * 2</gadget>
<output>1_038_240</output>

<result>1_038_240</result>