Among the 300 natural numbers from 1 to 300, how many do not contain the number 3?
在1-300的300个自然数中，不含数字3的有多少个．
<gadget id="calculator">10 * 3</gadget>
<output>30</output>

<gadget id="calculator">9 * 3</gadget>
<output>27</output>

<gadget id="calculator">30 + 27 + 1</gadget>
<output>58</output>

<gadget id="calculator">300 - 58</gadget>
<output>242</output>

<result>242</result>