static void Main(string[] args)
{
Console.Write("Enter first variable -> ");
int firstV = int.Parse(Console.ReadLine());
Console.Write("Enter second variable -> ");
int secondV = Int32.Parse(Console.ReadLine());
Console.Write("Enter third variable -> ");
int thirdV = Int32.Parse(Console.ReadLine());
var operations = new ArithmeticOperations();
operations.Average(firstV, secondV, thirdV);
Console.WriteLine(operations.Sum(firstV, secondV, thirdV));
Console.WriteLine(operations.Average(firstV, secondV, thirdV));
var tell = new Tell();
Console.WriteLine("What is your name?");
var name = Console.ReadLine();
tell.Greeting(name);
}