Console Input-Output - Task 6

using System;
/*
 * Write a program that reads the coefficients a, b and c of a quadratic equation ax2 + bx + c = 0 and solves it (prints its real roots
 */
class QuadraticEquation
{
    static int Main()
    {
        Console.Write("a = ");
        float a = float.Parse(Console.ReadLine());
        Console.Write("b = ");
        float b = float.Parse(Console.ReadLine());
        Console.Write("c = ");
        float c = float.Parse(Console.ReadLine());
        double D = b * b - (4 * a * c);
        double x1, x2;
        if (D > 0)
        {
            x1 = (-b + Math.Sqrt(D)) / (2 * a);
            x2 = (-b - Math.Sqrt(D)) / (2 * a);
            Console.WriteLine("X1 = {0:0.####,10}\nX2 = {1:0.####,10}",x1,x2);
            Console.Read();
            return 1;
        }
        if (D < 0)
        {
            Console.WriteLine("no real roots");
            Console.Read();
            return 1;
        }
        else
        {
            x1 = -b / (2 * a);
            Console.WriteLine("X1=X2={0:0.####,10}", x1);
            Console.Read();
        }
        return 0;
    }
}