Question: Mathematicians talk about the Fibonacci Sequence, which is a series of numbers defined recursively. The first Fibonacci number is 0, and the second is 1.

Mathematicians talk about the Fibonacci Sequence, which is a series of numbers defined recursively. The first Fibonacci number is 0, and the second is 1. From there on out, the nth Fibonacci number is Fib(n) = Fib(n − 2) + Fib(n − 1). Write a function to input an integer index and then calculate that index value in the Fibonacci sequence.

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