double a = double.Parse(Console.ReadLine());
double b = double.Parse(Console.ReadLine());
double c = double.Parse(Console.ReadLine());
double d = b * b - 4 * a * c;
Console.WriteLine("There isn't quadratic Roots");
Console.WriteLine("X1=X2={0}", x);
double x1 = (-b - Math.Sqrt(d)) / (2 * a);
double x2 = (-b + Math.Sqrt(d)) / (2 * a);
Console.WriteLine("X1={0}; X2={1}", x1, x2);