What is the smallest natural number that can be expressed as the sum of 9, 10 and 11 consecutive non-zero natural numbers at the same time?
能同时表示成连续9个、10个和11个非零自然数的和的最小自然数是多少．
<gadget id="calculator">10 * 44</gadget>
<output>440</output>

<gadget id="calculator">440 + 55</gadget>
<output>495</output>

<result>495</result>