H6_Loops_T7_Fibonacci

using System;
using System.Numerics;


class Fibonacci
{
    static void Main()
    {
        Console.WriteLine("Please enter how many Fibonacci members do you want to sum:");
        int numberOfFibonacciMembers = int.Parse(Console.ReadLine());
        if (numberOfFibonacciMembers <= 0)
        {
            Console.WriteLine("Invalid input!");
        }

        if (numberOfFibonacciMembers == 1)
        {
            Console.WriteLine("The sum of your 1 fibonnacci members is: 0");
        }
        if (numberOfFibonacciMembers == 2)
        {
            Console.WriteLine("The sum of your 2 fibonnacci members is: 1");
        }
        BigInteger fibonacciMemberX = 0;
        BigInteger fibonacciMemberOne = 0;
        BigInteger fibonacciMemberTwo = 1;
        BigInteger SumofNFibonacciMembers = 1;
        if (numberOfFibonacciMembers > 2)
        {

            for (int i = 3; i <= numberOfFibonacciMembers; i++)
            {

                fibonacciMemberX = fibonacciMemberOne + fibonacciMemberTwo;
                SumofNFibonacciMembers = SumofNFibonacciMembers + fibonacciMemberX;
                fibonacciMemberOne = fibonacciMemberTwo;
                fibonacciMemberTwo = fibonacciMemberX;
            }
            Console.WriteLine("The sum of your {0} fibonnacci members is: {1}", numberOfFibonacciMembers,SumofNFibonacciMembers);
        }

    }
}