private static void Main(string[] args)
{
Console.Write("Enter the first number: ");
string firstNumber = Console.ReadLine();
Console.Write("Enter the second number: ");
string secondNumber = Console.ReadLine();
int result = MathLib.Calculation(int.Parse(firstNumber), int.Parse(secondNumber));
Console.WriteLine("{0} + {1} = {2}", firstNumber, secondNumber, result);
Console.ReadKey();
}