Starting from 1, write 1234...202122...20082009 in the order of natural numbers, how many numbers "0" are written in total.
从1开始，按自然数的顺序写1234…202122…20082009，一共写了多少个数字"0"．
<gadget id="calculator">9 + 180 + 3 + 18 + 18 + 180 + 3 + 18</gadget>
<output>429</output>

<result>429</result>