Ask: What is the sum of all the consecutive natural numbers from 1 to 999?
求：1～999这些连续自然数所有数字之和是多少？
<gadget id="calculator">1 + 9</gadget>
<output>10</output>

<gadget id="calculator">9 / 2</gadget>
<output>9/2 = around 4.5</output>

<gadget id="calculator">10 * (9/2) * 100 * 3</gadget>
<output>13_500</output>

<result>13_500</result>