using System;

public class Program

{

    public static void Main()

    {

        int a, b, c;

        float d;

        Console.WriteLine("---------------ASM 02----------------");

        Console.Write("Nhap he so a: ");

        a = Convert.ToInt32(Console.ReadLine());

        Console.Write("Nhap he so b: ");

        b = Convert.ToInt32(Console.ReadLine());

        Console.Write("Nhap he so c: ");

        c = Convert.ToInt32(Console.ReadLine());

        d = b  * b - 4 * a * c;

        if(d > 0)

        {

            Console.WriteLine("Phuong trinh co hai nghiem phan biet: ");

            Console.WriteLine("X1 = " + (- b + Math.Sqrt(d)) / (2*a));

            Console.WriteLine("X2 = " + (- b - Math.Sqrt(d)) / (2*a));

        }

        else if(d == 0)

        {

            Console.WriteLine("Phuong trinh co nghiem kep: ");

            Console.WriteLine("X1 = X2 = " + - b / (2.0 * a));

        }

        else if(d < 0)

        {

            Console.WriteLine("Phuong trinh vo nghiem");

        }

        Console.WriteLine("-------------------------------------");

    }

}