Classes A, B, and C of the sixth grade of Guangming Primary School organized a cultural evening and performed 14 programs in total. If each class performs at least 3 programs, how many different situations are there in the number of programs performed by these three classes?
光明小学六年级甲、乙、丙三个班组织了一次文艺晚会，共演出14个节目．如果每个班至少演出3个节目，那么，这三个班演出节目数的不同情况共有多少种．
<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<gadget id="calculator">6 * 2</gadget>
<output>12</output>

<gadget id="calculator">9 + 12</gadget>
<output>21</output>

<result>21</result>