using System;

public class Program

{

    enum RoundType

    {

        Down,

        Up,

        Default

    }

    public static void Main()

    {

        double num = 209.5435;

        double num2 = 488;

        Console.WriteLine(num);

        Console.WriteLine(Math.Round(num));

        Console.WriteLine(RoundTo(num2,50, RoundType.Down));

    }

    private static int RoundTo(double num, int roundTo, RoundType roundType=RoundType.Default)

    {

        if (roundType == RoundType.Default)

            return (int) Math.Round(num / roundTo) * roundTo;

        if (roundType == RoundType.Down)

            return (int) Math.Floor(num / roundTo) * roundTo;

        if (roundType == RoundType.Up)

            return (int) Math.Ceiling(num / roundTo) * roundTo;

        return -1;

    }

}