using System;

​

public class Program

{

    public static void Main()

    {

        Print("One");

        Print("One", "Two");

        Print("One", "Two", 3);

        Print("One", optionalNumber: 3);

    }

​

    static void Print(string required, string optionalString = "Default string", int optionalNumber = 123)

    {

        Console.WriteLine($"{required}, {optionalString}, {optionalNumber}");

    }

}