# Filename: fibs.py
# Author: Brian L. Walter
# Calculated Fiction, Winter 2008
# Description of contents:
#   Computes Fibonacci #s.


def fib(n):
    """Takes a whole number input and returns the corresponding Fibonacci number."""
    if n == 1 or n == 2:
        return 1
    elif n < 1:
        return "Error!"
    else:
        # f(n) = f(n-1) + f(n-2)
        return fib(n-1) + fib(n-2)

def main():
    # TELL BRIAN TO ADD COMMENTS LATER!
    print "\nLet me find a Fibonacci number for you."
    inputnum = int(raw_input("Which one would you like? Enter a whole number. "))
    
    print "\nThe " + str(inputnum) + "th Fibonacci number is " \
          + str(fib(inputnum)) + ".\n"
    
main()