The sunflower team participates in group activities. If there are no 6 people in a group or every 9 people in a group, there are exactly 3 people left. How many people does this team have at least?
向日葵小分队参加集体活动，没6人分一组或每9人分一组都正好剩3人，这个小分队至少有多少
<gadget id="calculator">2 * 3 * 3</gadget>
<output>18</output>

<gadget id="calculator">18 + 3</gadget>
<output>21</output>

<result>21</result>