Difficult# Digit Values: Arithmetic to Create a Number Divisible by Five

GMAT-BYC4IA

A number $34856.fy$ is first multiplied by $100$ and then added to $(f-y)$ to create a number divisible by $5$ and less than $3,485,659$.

What is the value of $f$ in the greatest possible value of $34856.fy$?