//DARIA, TIMOTHY JAN E. (Student #1)

//JIMENEZ, JUNAICA M. (Student #2)

//CCP 1103 - ITBC

//FIBONACCI FACTORIAL SUM

using System;

public class Program

{

    public static void Main()

    {

            string number;

            int inputNumber;

            int sum;

            int firstNumber = 0;

            int secondNumber = 1;

            int factorial = 1;

            int total = 0;

​

            Console.WriteLine("Fibonacci Factorial Sum");

            Console.Write("\nEnter a number: ");

            number = Console.ReadLine();

​

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

            {

                if (inputNumber <= 0)

                {

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

                }

                else if (inputNumber > 6) 

                {

                    Console.WriteLine("The input number ranges from 1 to 6 only.");

                }

                else

                {

                    for (int i = 1; i < inputNumber; i++)

                    {

                        sum = firstNumber + secondNumber;

                        firstNumber = secondNumber;

                        secondNumber = sum;

​

                        for (int n = 1; n <= secondNumber; n++)

                        {

                            factorial = factorial * n;

                        }

                        total += factorial;

                        factorial = 1;

                    }

                    total += 1;

                    Console.WriteLine("The fibonacci factorial sum of {0} is {1:#,0}.", number, total);

                }

            }

            else

            {

                Console.WriteLine("Invalid input. Please enter a numeric value.");

            }

    }

}