//ODULIO, JOSEPH PAUL G.

//CCP-1103 - ITDC

//FIBONACCI FREEZE

using System;

public class Program

{

    public static void Main(string [] args)

    {

        int number;

        int fibonacciFreeze = 0;

        int frozenNumber = 1;

        string inputNumber;

​

        Console.WriteLine("Enter a number: ");

        inputNumber = Console.ReadLine();

        if(Int32.TryParse(inputNumber, out number) == true)

        {       

            if(number > 0)

            {       

                if(number <= 50)

                {           

                    for(int x = 0; x < number; x++)

                    {           

                        int counter = fibonacciFreeze;

                        fibonacciFreeze = frozenNumber;

                        frozenNumber += counter;

                    }                       

                    Console.WriteLine("The fibonacci number for " + number +" is {0:0}", Math.Abs(fibonacciFreeze));                        

                }

                else

                {                       

                    Console.Write("Above 50 is not allowed. Please Enter from 1-50.");

                }

              }

            else

            {                   

                Console.Write("Zero or negative input is not allowed.");

            }

        }

        else

        {               

            Console.Write("Invalid input. Please enter a valid input.");

        }

    }

}