In the natural numbers 1-1000, how many times does the number 8 appear?
在自然数1-1000中，数字8共出现了多少次．
<gadget id="calculator">20 * 10</gadget>
<output>200</output>

<gadget id="calculator">200 + 100</gadget>
<output>300</output>

<result>300</result>