Try the Fibonacci Finder interview problem.

Fibonacci Finder

Create a `fib_finder()` function that finds the nth number in the Fibonacci sequence. As a reminder, the Fibonacci sequence is a mathematical sequence that begins with 0 and 1, with each following term being the sum of the two previous terms.

For example, the first two terms of the sequence are represented by `fib_finder(1)` and `fib_finder(2)`, which return `0` and `1`, respectively. `fib_finder(6)` should return `5`.

This challenge was reported to have been asked in interviews at many top companies, including Google. If you've covered the material in [Pass the Technical Interview with Python](https://www.codecademy.com/learn/paths/pass-the-technical-interview-with-python) or an equivalent, you should be able to solve this challenge. If you have trouble, try refreshing your knowledge with its [Dynamic Programming](https://www.codecademy.com/paths/pass-the-technical-interview-with-python/tracks/interview-prep-and-practice/modules/python-interview-problems/articles/introduction-to-dynamic-programming-in-python) article.