5
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
What is $8-4 \div 2-1$?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
5
What is $8-4 \div 2-1$?
train