Taking the "⎾ ⏌" bracketa as meaning "integer part of its content" and "log200" as log in base 200:
The operation has three contributions: The X part, the Y part and 7. The value of the part affecte by X is "capped" at 7 due to the "mod 8" operation so this part can have a value 0<=n<8. The part due to Y has a value of 7 for a Y value of 80 millions approximately. So Y has the greater influence for very high values. At low values i.e. arround 10 the Y part is almost 1, but X part can be greater, equal or lower (0).... for Y value of 1000 the Y part is about 2 , etc.
