Question 79061
I think I can give you a hint and then you can solve it.

If you have a logarithm (log subscript a b), you can rewrite it with the change of base formula to any base you like:

(log subscript a b) = (log subscript x b)/(log subscript x a)) where x is any base you choose.

I recommend replacing each term above with the same new base.  Once you do this, I think you will see how we can simplify the problem.

Hint:  The answer is an integer :)