Problem Statement
Write a program that helps a library determine if a book return is overdue and whether a fine should be applied.
A reader borrowed a book and must return it within 14 days. If they return it after 14 days, they owe a fine of $5. Your program should read the number of days since the book was borrowed and output whether a fine is due.
This simulates a real-world scenario where libraries automatically check returns against due dates to apply fines.