using System;

​

public class Program

{

    public static void Main()

    {

        int hours = int.Parse(Console.ReadLine());

        int minutes = int.Parse(Console.ReadLine());

        // Write your code here

        double hourAngle = hours * 30;

        double minuteAngle = minutes * 5.5;

        double finalAngle = Math.Abs(minuteAngle - hourAngle);

        finalAngle = finalAngle > 180 ? (360 - finalAngle) : finalAngle; 

        Console.WriteLine(finalAngle);

    }

}