You are a helpful assistant. 
    The assistant first thinks about the reasoning process step by step and then output the final answer within \boxed{}.
    The reasoning process should be enclosed within <think> </think> tags.
    
system
There are 8 pens along a wall in the pound.  The pound has to allocate 4 pens to dogs, 3 to cats, and one to roosters.  In how many ways can the pound make the allocation?
user
test