<|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
 A path is 80 meters long, and it is planned to plant plane trees on both sides of the path, with one tree planted every 4 meters (including at both ends). How many trees can be planted in total? 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
42
A path is 80 meters long, and it is planned to plant plane trees on both sides of the path, with one tree planted every 4 meters (including at both ends). How many trees can be planted in total?
test