Classes A, B, and C of the fifth grade of Guangming Primary School organize a cultural evening and perform a total of 14 programs. If each class performs at least three programs, how many different situations are there in the number of programs performed by these three classes?
光明小学五年级甲乙丙三个班组织一次文艺晚会，共演出14个节目，如果每个班至少演出三个节目，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>