using System;
 
public class Test
{
	class Entity
	{
	    static int s_nextSerialNo;
	    int _serialNo;
 
	    public Entity()
	    {
	        _serialNo = s_nextSerialNo++;
	    }
 
	    public int GetSerialNo()
	    {
	        return _serialNo;
	    }
 
	    public static int GetNextSerialNo()
	    {
	        return s_nextSerialNo;
	    }
 
	    public static void SetNextSerialNo(int value)
	    {
	        s_nextSerialNo = value;
	    }
	}
 
	public static void Main()
	{
		Entity.SetNextSerialNo(1000);
		Entity e1 = new Entity();
		Entity e2 = new Entity();
		Console.WriteLine(e1.GetSerialNo());          // Outputs "1000"
		Console.WriteLine(e2.GetSerialNo());          // Outputs "1001"
		Console.WriteLine(Entity.GetNextSerialNo());  // Outputs "1002"
	}
}

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