how calculate this method Fn = Fn-1 + Fn-2

how calc  Recursion method that takes an integer value and returns the summation of all numbers
Fn = Fn-1 + Fn-2
For example: F(10) = 0,1,1,2,3,5,8,13,21,34
Summation = 88
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myaspnetAuthor Commented:
static void Main(string[] args)
           int input;
           System.Console.Write("Enter Number please : ");
            input = int.Parse(System.Console.ReadLine());
            int R=fibonacci(input)-1;
        public static int fibonacci(int N)
            if (N < 2)
                return 1;
            int Result;
            Result = fibonacci(N - 1) + fibonacci(N - 2);
            return Result;

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kaufmed 👽Commented:
I see that you made a new question for your homework problem. You do realize it is not permissible for us to do your homework for you, right?

Since you apparently don't understand what recursion is, why don't you ask that instead of asking us to do your work for you?
myaspnetAuthor Commented:
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