TAOCP: Half way into mathematical preliminaries

I have now taken a custom of reading taocp right before going to bed. Tonight I read sections 1.2.3 (Sums and Products), 1.2.4 (Integer Functions and Elementary Number theory) and 1.2.5 (Permutations and Factorials). I've now read almost a half of section 1.2, and the text is getting denser. I'm definitely waiting for the maths section to be over and get to delve into the description of MIX which is the hypothetical computer used throughout the book series.