using System;

public class Test
{
	public static void Main()
	{
        int hours = 23;
        int minutes = 5;

        Math.DivRem(hours, 12, out hours);
        var minutesAngle = minutes * 6;
        var hoursAngle = hours * 30 + (minutes / 2.0);

        Console.WriteLine(Math.Abs(hoursAngle - minutesAngle));
        Console.ReadLine();
	}
}