using System;

public class Program

{

    public const double delta = 0.618;

    public const double betta = 0.382;

    static double func(double x)

    {

        return 2 * Math.Pow(x,4) - Math.Pow(x,2) - 10;

    }

    public static void Main()

    {

        double a = -20, b = 20;

        double eps = 0.1;

        Console.WriteLine("f(min) = " + FindMin(a,b,eps));

        Console.WriteLine("f(max) = " + FindMax(a,b,eps));

    }

    static double FindMin(double a, double b, double eps)

    {

        int iteration = 0;

        while(true)

        {

            iteration ++;

            double x1,x2;

            x1 = delta * a + betta * b;

            x2 = betta * a + delta * b;

            if(func(x1) >= func(x2))

                a = x1;

            else

                b = x2;

            if(Math.Abs(b - a) < eps)

                break;

        }

        return (a + b) / 2;

    }

    static double FindMax(double a, double b, double eps)

    {

        int iteration = 0;

        while(true)

        {

            iteration ++;

            double x1,x2;

            x1 = delta * a + betta * b;

            x2 = betta * a + delta * b;

            if(func(x1) <= func(x2))

                a = x1;

            else

                b = x2;

            if(Math.Abs(b - a) < eps)

                break;

        }

        return (a + b) / 2;

    }

}