using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        double armLength = 18;

        for (int i = 0; i < 200; i++)

        {

            armLength += 0.1;

            double aMax = double.MinValue;

            double aMin = double.MaxValue;

            for (double j = 5.0; j < 10.5; j+=0.1)

            {

                double angle = Foo(j, armLength);

                aMin = Math.Min(aMin, angle);

                aMax = Math.Max(aMax, angle);

            }

            if (!double.IsNaN(aMin) && !double.IsNaN(aMax))

            {

                Console.WriteLine("{0:##.0}: {1} ", armLength, Math.Abs(aMin -aMax));

            }

        }

    }

    private static double Foo(double x, double y)

    {

        return Math.Acos((x*x + y*y - 22.2*22.2)/(2*x*y))*(180/Math.PI);

    }

}