import functools

@functools.lru_cache()
def fibonacci(nthNumber):
    print('fibonacci(%s) called.' % (nthNumber))
    if nthNumber == 1 or nthNumber == 2:
        # BASE CASE
        print('Call to fibonacci(%s) returning 1.' % (nthNumber))
        return 1
    else:
        # RECURSIVE CASE
        print('Calling fibonacci(%s) (nthNumber - 1).' % (nthNumber - 1))
        result = fibonacci(nthNumber - 1)

        print('Calling fibonacci(%s) (nthNumber - 2).' % (nthNumber - 2))
        result = result + fibonacci(nthNumber - 2)

        print('Call to fibonacci(%s) returning %s.' % (nthNumber, result))
        return result

print(fibonacci(99))