using System;

namespace Example
{
    class Program
    {
        static void Main()
        {
            double a = double.Parse(Console.ReadLine());
            double b = double.Parse(Console.ReadLine());
            double c = double.Parse(Console.ReadLine());


            if (a > 0)
            {
                double x1 = 0;
                double x2 = 0;
                double discriminant = b * b - 4 * (a * c);

                if (discriminant > 0)
                {
                    x1 = ((-b) - Math.Sqrt(discriminant)) / 2 * a;
                    x2 = ((-b) + Math.Sqrt(discriminant)) / 2 * a;
                    Console.WriteLine($"X1 = {x1}");
                    Console.WriteLine($"X2 = {x2}");
                }

                else if (discriminant == 0)
                {
                    x1 = (-b) / 2 * a;
                    Console.WriteLine($"X1 = {x1}");
                }

                else
                {
                    Console.WriteLine("No real roots!");
                }
            }

            else
            {
                Console.WriteLine("Queficent a should be bigger than zero.");
            }
        }
    }
}