using System;

public class Program

{

    public static void Main()

    {

            Console.WriteLine("Give first number: ");

        int n1 = Convert.ToInt32(Console.ReadLine());

        Console.WriteLine("Give second number: ");

        int n2 = Convert.ToInt32(Console.ReadLine());

        for (int n = n1; n<=n2; n++)

        {

        var result = n*n + 2*n + 3;

        Console.WriteLine("f({0}) = {0}{0} + 2{0} + 3 = {1}", n, result);

        }

    }

}