using System;

class ConsoleApp1
{
    static void Main()
    {
        Console.Write("a = ");
        double a = double.Parse(Console.ReadLine());
        Console.Write("b = ");
        double b = double.Parse(Console.ReadLine());
        Console.Write("c = ");
        double c = double.Parse(Console.ReadLine());

        double D = b * b - 4 * a * c;
        if (D > 0)
        {
            double x2 = ((-b) + Math.Sqrt(D)) / (2 * a);
            double x1 = ((-b) - Math.Sqrt(D)) / (2 * a);
            Console.WriteLine("x1 = {0}; x2 = {1}", x1, x2);
        }
        else if (D == 0)
        {
            double x1Andx2 = ((-b) + Math.Sqrt(D)) / (2 * a);
            Console.WriteLine("x1 = x2 = {0}", x1Andx2);
        }
        else if (D < 0)
        {
            Console.WriteLine("Няма решение!");
        }
    }
}