using System;

class X {
	static X ()
	{
		test.global = 1;
	}
}

class Y : X {
}

class Z : Y {
	public Z ()
	{
	}
}

class test {
	static public int global;
	
	static int Main ()
	{
		Z z = new Z ();
		
		if (global != 1){
			Console.WriteLine ("Error");
			return 1;
		}
		Console.WriteLine ("Ok");
		return 0;
	}
}