For how many two-digit prime numbers is the sum of its digits 8?
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
For how many two-digit prime numbers is the sum of its digits 8?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
3
For how many two-digit prime numbers is the sum of its digits 8?
train