What is the sum of the coordinates of the midpoint of a line segment with endpoints at $(3,1)$ and $(5,1)$?
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
What is the sum of the coordinates of the midpoint of a line segment with endpoints at $(3,1)$ and $(5,1)$?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
5
What is the sum of the coordinates of the midpoint of a line segment with endpoints at $(3,1)$ and $(5,1)$?
train