<|im_start|>system
You are a helpful assistant. You first think about the reasoning process in the mind and then provide the user with the answer. You should try to truely solve the question by yourself without cheating.  <|im_end|>
<|im_start|>user
 Distribute all 4 newly transferred students among the three classes of senior year 3 (Class 1), (Class 2), and (Class 3), ensuring at least one student is placed in each class. Given that student A cannot be assigned to senior year 3 (Class 1), find the number of different allocation plans. Express your answer as a single numerical value. Show your work in <think> </think> tags. And return the final answer in <answer> </answer> tags.<|im_end|>
<|im_start|>assistant
Let me solve this step by step.
<think>
user
24
Distribute all 4 newly transferred students among the three classes of senior year 3 (Class 1), (Class 2), and (Class 3), ensuring at least one student is placed in each class. Given that student A cannot be assigned to senior year 3 (Class 1), find the number of different allocation plans. Express your answer as a single numerical value.
test