using System;

public class Program

{

  class Cat

  {

    public static int count = 0;

    public static void Meow()

    {

      Console.WriteLine("Meow");

    }

    public Cat()

    {

      count++;

    }

  }

​

  public static void Main()

  {

    Cat c1 = new Cat();

    Cat c2 = new Cat();

    Console.WriteLine(Cat.count); // 2

    Cat.Meow(); // Meow

  }

}