"""A naive Python implementation of the Fibonacci function, timed from start to end."""

import time

def fib(n):
    if n <= 2:
        return 1
    else:
        return fib(n - 1) + fib(n - 2)

def main():
    start_time = time.time()
    print(fib(20))
    end_time = time.time()
    print('Test runtime: %f' % (end_time - start_time))

if __name__ == '__main__':
    main()