using System;

namespace TestMethods
{
	class Class1
	{
		public static int Main()
		{
			int test_int = 1;
			TestClass testClass = new TestClass();
			test_int *= testClass.AddItem (new TestParam());
			test_int *= testClass.AddItem (new ParamClass());

			int base_int = 1;
			BaseClass baseClass = testClass as BaseClass;
			base_int *= baseClass.AddItem (new TestParam());
			base_int *= baseClass.AddItem (new ParamClass());

			return (test_int == 4 && base_int == 9) ? 0 : 1;
		}
	}
	
	public class ParamClass {}
	
	public class TestParam : ParamClass {}
	
	public abstract class BaseClass
	{
		public abstract int AddItem (ParamClass val);
	}
	
	public class TestClass : BaseClass
	{
		public int AddItem (object val)
		{
			return 2;
		}
		
		public override int AddItem (ParamClass val)
		{
			return 3;
		}
	}
}