using System;

public class Program

{

    public static void Main()

    {

        /*

        int h1,h2;

        double diff;

        Console.WriteLine("pls write 2 heights");

        h1=int.Parse(Console.ReadLine());

        h2=int.Parse(Console.ReadLine());

        diff=Math.Abs(h1-h2);

        Console.WriteLine(diff);

        */

        /*

        int a,b;

        double c;

        Console.WriteLine("pls write 2 numbers");

        a=int.Parse(Console.ReadLine());

        b=int.Parse(Console.ReadLine());

        c=Math.Pow(a,b);

        if (c>100)

            Console.WriteLine("big");

        else

            Console.WriteLine("small");

        */

        /*

        int a,b,c,diff1,diff2,diff3;

        a=int.Parse(Console.ReadLine());

        b=int.Parse(Console.ReadLine());

        c=int.Parse(Console.ReadLine());

        diff1=Math.Abs(a-b);

        diff2=Math.Abs(a-c);

        diff3=Math.Abs(c-b);

        if (diff1>diff2 && diff1>diff3)

            Console.WriteLine(diff1);

        else if (diff2>diff1 && diff2>diff3)

            Console.WriteLine(diff2);

        else

            Console.WriteLine(diff3);

        */

        int a,b,c;

        double d;

        Console.WriteLine("pls write a,b and c");

        a=int.Parse(Console.ReadLine());

        b=int.Parse(Console.ReadLine());

        c=int.Parse(Console.ReadLine());

        d=Math.Sqrt(Math.Pow(b,2)-4*a*c);

        if (d>0)

            Console.WriteLine(d);

        else 

            Console.WriteLine("no answer");

    }

}