using System;

public class Program

{

    public static void Main()

    {

        int A=7;

        int B=3;

        int C= A +B;

        Console.WriteLine(C);

           C= A -B;

         Console.WriteLine(C);

           C= A * B;

         Console.WriteLine(C);

         double  D= A / (double) B;

        Console.WriteLine(D);

         Console.WriteLine("Hello World"); 

         Console.WriteLine("Hello Wo rld"); 

    }   

}