How many 4-digit numbers have the ones digit 6 and are divisible by 3?
个位数是6，且能被3整除的四位数共有多少个．
<gadget id="calculator">1_000 - 1</gadget>
<output>999</output>

<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>

<result>300</result>