Children are playing games, one person is more in a group of 3, and 6 people are less in a group of 7, at least how many children are playing games?
小朋友们做游戏，3人一组多1人，7人一组少6人，至少有多少个小朋友在做游戏？
<gadget id="calculator">3 * 7</gadget>
<output>21</output>

<gadget id="calculator">21 + 1</gadget>
<output>22</output>

<result>22</result>