Add 3 to a number, multiply by 3, subtract 3, divide by 3, and the final result is 3. Q: What is this number?
一个数加上3，乘以3，减去3，除以3，最后结果等于3．问：这个数是几？
<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<gadget id="calculator">9 + 3</gadget>
<output>12</output>

<gadget id="calculator">12 / 3</gadget>
<output>4</output>

<gadget id="calculator">4 - 3</gadget>
<output>1</output>

<result>1</result>