public static void Main()
{
HandCalculator handHandCalculator = new HandCalculator();
int sum = handHandCalculator.Add(1, 2);
int difference = handHandCalculator.Subtract(5, 4);
int product = handHandCalculator.Multiply(5, 4);
int quotient = handHandCalculator.Divide(10, 2);
Console.WriteLine("Done");
Console.ReadKey();
}