evaluate (Mod[2^b, 10^8]+1)*(ceil((2^b)/(10^8))/2^b)*Log2[2^b/ceil((2^b)/(10^8))]+(99999999-(Mod[2^b, 10^8]+1)+1)*(floor((2^b)/(10^8))/2^b)*Log2[2^b/floor((2^b)/(10^8))]-Log2[10^8] at b=256