using System;

public class Program

{

    public static void Main()

    {

        double w, x, y, a, b, c;

​

            x = 35.8;

            y = 20.2;

            w = 3.4;

​

            //MATH.ROUND(value/multipleOF)* MULTIPLEOF;

​

            a = Math.Round(x / 3) * 3;

            b = Math.Round(y / 3) * 3;

            c = Math.Round(w / 3) * 3;

​

​

            Console.WriteLine();

​

            Console.WriteLine("x = {0}",x);

            Console.WriteLine("y = {0}", y);

            Console.WriteLine("w = {0}", w);

​

            Console.WriteLine();

​

            Console.WriteLine("x = {0}", a);

            Console.WriteLine("y = {0}", b);

            Console.WriteLine("w = {0}", c);

​

            Console.WriteLine();

​

            Console.WriteLine("x =  " + (Math.Round(x / 5) * 5));

            Console.WriteLine("y =  " + (Math.Round(y / 5) * 5));

            Console.WriteLine("w =  " + (Math.Round(w / 5) * 5));

​

​

​

            Console.ReadLine();

            Console.WriteLine(Math.Round(x / 2) * 2); 

​

    }

}