using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine(S1.num);

        Console.WriteLine(I1.num);

        Console.WriteLine(new I1().val);

        Console.WriteLine(new I2().val);

        Console.WriteLine(I2.num);

    }

}

​

public static class S1 

{

    public static int num = 1;

    static S1() 

    {

        num = 2;

    }

}

​

public class I1

{

    public static int num = 1;

    public int val { get { return num; } }

​

    static I1 ()

    {

        num = 2;

    }

}

​

public class I2

{

    public static int num = 1;

    public int val { get { return num; } } 

    static I2 ()

    {

        num = 2;

    }

}