'Concrete Mathematics'

I bought a book once too often. Today I received an Amazon box including 'Concrete Mathematics' by D. Knuth, despite still not finishing 'SICP', 'Mathematics, Form and Function' and all that. I wonder when I can reade it. However, I believe that there are some books that have value by just keeping around. Of cource, I'm positive that I shall get on reading 'Concrete Mathematics' with great pleasure soon.