using System;

public class Program

{

    public static void Main()

    {

        double y = 0;

        double z = 0.5;

        double x = Math.Acos(z);

        if ( x > 1 )

        {

            y = 5 * Math.Pow (z, 3) + 1 ;

            Console.WriteLine( y );

        }

        else

        {

            y = 6 * Math.Pow (z, 2) - 5 ;

            Console.WriteLine( y );

        }

    }

}