Calculation: 1+2+3+4+...+297+298+299+300=how much.
计算：1+2+3+4+…+297+298+299+300=多少．
<gadget id="calculator">1 + 300</gadget>
<output>301</output>

<gadget id="calculator">300 / 2</gadget>
<output>150</output>

<gadget id="calculator">301 * 150</gadget>
<output>45_150</output>

<result>45_150</result>