class Program
    {
        static void Main(string[] args)
        {
            var shapes = new List<Shape>()
            {
                new Rectangle() { Height = 20.5, Width=40.7},
                new Square() { Width = 35.4},
                new Circle() { Radius = 1.5 }
            };

            var shapeCalculations = new ShapeCalculations();
            var totalArea = shapeCalculations.CalculateTotalArea(shapes);

            Console.WriteLine($"Total area: {totalArea}");
        }
    }