How many two-digit primes have a ones digit of 1?
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
How many two-digit primes have a ones digit of 1?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
5
How many two-digit primes have a ones digit of 1?
train