How many three-digit numbers do not contain 0 and are divisible by 3?
不含有0，且能被3整除的三位数有多少个．
<gadget id="calculator">999 - 102</gadget>
<output>897</output>

<gadget id="calculator">897 / 3</gadget>
<output>299</output>

<gadget id="calculator">299 + 1</gadget>
<output>300</output>

<gadget id="calculator">6 * 6</gadget>
<output>36</output>

<gadget id="calculator">7 * 3</gadget>
<output>21</output>

<gadget id="calculator">36 + 21</gadget>
<output>57</output>

<gadget id="calculator">300 - 57</gadget>
<output>243</output>

<result>243</result>