Evaluate $\lfloor17.2\rfloor+\lfloor-17.2\rfloor$.
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Evaluate $\lfloor17.2\rfloor+\lfloor-17.2\rfloor$.
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
-1
Evaluate $\lfloor17.2\rfloor+\lfloor-17.2\rfloor$.
train