using System;

public class Program

{

    public static void Main()

    {

        //Console.WriteLine("Hello World");

        Program p=new Program();

        p.MyPrint();

        p.MyPrint("mohamed"," Goumih");

        p.MyPrint("a" ,"b" ,"c");

        p.MySum(1,2);

    }

    //method overloading 

     void MyPrint()

  {

    System.Console.WriteLine("Hello World");

  }

    void MyPrint(string s1, string s2)

{

  System.Console.WriteLine(s1 + s2);

}

    void MyPrint(params string[] s)

{

  foreach (string x in s)

    System.Console.WriteLine(x);

}

    void MySum(int i, int j = 0, int k = 0)

  {

    System.Console.WriteLine(1*i + 2*j + 3*k);

  }

}