<|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
 The mass of 1 cubic meter of a substance is 500 kg under certain conditions. The volume in cubic centimeters of a certain mass of this substance under these conditions is 2. What is the mass of the substance for which the volume is given? 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
1000
The mass of 1 cubic meter of a substance is 500 kg under certain conditions. The volume in cubic centimeters of a certain mass of this substance under these conditions is 2. What is the mass of the substance for which the volume is given?
test