Xiao Ming counts from 1 to 9. When the 1000th number is reported, what is the sum of all Xiao Ming's numbers.
小明按1～9报数，当报完第1000个数时，小明所有数之和是多少．
<gadget id="calculator">111 * 45</gadget>
<output>4_995</output>

<gadget id="calculator">4_995 + 1</gadget>
<output>4_996</output>

<result>4_996</result>