Basic arithmetic operations

using System;

     //C# basic arithmetic operations.

class HelloWorld
{

  static void Main ()
  {

    
     Console.Write("Enter first number");
     int firstnumber = int.parse(Console.RedLine());
     
     Console.Write("Enter second numner");
     int secondnumber = int.parse(Console.RedLine());
     
     int sum = firstnumber + secondnumber;
     int sub = firstnumber - secondnumber;
     int mul = firstnumber * secondnumber;
     
     Console.writeLine("The sum of enter numbers : " + sum);
     Console.writeLine("The Subtraction of enter numbers : " + sub);
     Console.writeLine("The multiplication of enter numbers : " + mul);

  }

}