Arrange the natural numbers whose digit sum is 4 in a row from small to large, what number is 2011?
将各位数字的和为4的自然数由小到大排成一列，2011是第多少个．
<gadget id="calculator">1 + 4 + 9 + 10</gadget>
<output>24</output>

<result>24</result>