How many 4-digit numbers are there that has a unit digit of 5 and is divisible by 3?
个位数是5，且能被3整除的四位数有多少个．
<gadget id="calculator">1_000 - 3</gadget>
<output>997</output>

<gadget id="calculator">997 - 100</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>