using System;

public class Program

{

    public static void Main()

    {

        int x = 0;

        double res;

        Console.WriteLine("X>");

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

        res = (Math.Pow(x,2) -  7*x + 10)/(Math.Pow(x,2) -  8*x +  12);

        Console.WriteLine("Result="+res);

        Console.ReadLine();

    }

}