<|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
 Thirteen ducks are swimming in a lake. Twenty more ducks come to join them. Then, an unknown number of ducks, represented by x, also join them. How many ducks are swimming in the lake? 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
33
Thirteen ducks are swimming in a lake. Twenty more ducks come to join them. Then, an unknown number of ducks, represented by x, also join them. How many ducks are swimming in the lake?
test