How many additional function calls does fib(n) require if "LINE 3" is removed?

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Published on 2010-03-13T10:15:36Z Indexed on 2010/03/13 10:25 UTC
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algorithms

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complexity

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fibonacci

I just got this question on a interview and had no idea how to calculate the answer.
How many additional function calls does fib(n) require if "LINE 3" is removed? The answer should be in terms on n.

int fib(int n) {
  if(n == 0) return 0;
  if(n == 1) return 1;
  if(n == 2) return 1; //LINE 3 HERE <---

  return fib(n - 1) + fib(n - 2);
}

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