<|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
 Place 5 different balls into 4 different boxes, ensuring that each box is not empty. How many different ways can this be done? 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
240
Place 5 different balls into 4 different boxes, ensuring that each box is not empty. How many different ways can this be done?
test