` C# CSharp

static void Main(string[] args)
{
    // Read and assign the returned and due dates
    DateTime returnedDate = AssignDate(Console.ReadLine());
    DateTime dueDate = AssignDate(Console.ReadLine());

    // Calculate and display the fine
    if (returnedDate <= dueDate)
    {
        Console.WriteLine(0); // No fine if returned on or before the due date
    }
    else
    {
        int fine = 0;

        if (returnedDate.Year > dueDate.Year)
        {
            // Fine is fixed at 10000 if the return is in a different year
            fine = 10000;
        }
        else if (returnedDate.Month > dueDate.Month)
        {
            // Fine for being late by months within the same year
            fine = 500 * (returnedDate.Month - dueDate.Month);
        }
        else if (returnedDate.Day > dueDate.Day)
        {
            // Fine for being late by days within the same month and year
            fine = 15 * (returnedDate.Day - dueDate.Day);
        }

        Console.WriteLine(fine);
    }
}

// Method to parse input and return a DateTime object
public static DateTime AssignDate(string dateInput)
{
    string[] dateSplit = dateInput.Split(' ');
    int day = Convert.ToInt32(dateSplit[0]);
    int month = Convert.ToInt32(dateSplit[1]);
    int year = Convert.ToInt32(dateSplit[2]);

    return new DateTime(year, month, day); // Construct and return the DateTime
}