using static System.Console;

​

public static class Program {

    public static void Main(string[] args) => new Derivada(1, "");

}

​

public class Inicial {

    public Inicial() => WriteLine("Inicial"); //chamará base(), especificamente Object()

}

​

public class Base : Inicial {

    public Base(int x) : base() => WriteLine("Base");

}

​

public class Derivada : Base {

    public Derivada(int x, string y) : base(x) => WriteLine("Derivada");

}