How Many Times Fib Is Called

1counter: dict[str, int] = {"calls": 0}
2 
3def fib(n: int) -> int:
4    counter["calls"] = counter["calls"] + 1
5    if n < 2:
6        return n
7    return fib(n - 1) + fib(n - 2)
8 
9print(fib(5))
10print(counter["calls"])