What will be the output of this C# code?

What will be the output of this C# code?

abstract class Shape {
    public abstract double Area();
}
class Circle : Shape {
    private double radius = 3;
    public override double Area() {
        return 3.14 * radius * radius;
    }
}
class Program {
    static void Main() {
        Shape s = new Circle();
        System.Console.WriteLine(s.Area());
    }
}