using System;

class Base
{
    public virtual void Method(int a)
    {
	Console.WriteLine("Base.Method");
    }
}

class Derived : Base
{
    public override void Method(object o)
    {
	Console.WriteLine("Derived.Method");
    }
}

class Program
{
    static void Main(string args[])
    {
        new Derived().Method(3);
    }
}