#!/usr/bin/env python
# Copyright 2005 Daniel Cer (daniel.cer@cs.colorado.edu)
#
# This work is licensed under the Creative Commons Attribution-NonCommercial-
# ShareAlike License. To view a copy of this license, visit 
# http://creativecommons.org/licenses/by-nc-sa/2.5/ or send a letter to 
# Creative Commons, 543 Howard Street, 5th Floor, San Francisco, California, 
# 94105, USA.

import sys

def fibonacci(n):
   if n <= 0: return -1
   if n <= 2: return 1
   return fibonacci(n-1) + fibonacci(n-2)

if (len(sys.argv) != 2):
   print >>sys.stderr,  \
     "Usage:\n\t",sys.argv[0]," (n-th fibonacci # to calculate)"
   sys.exit(-1)

print "fibnacci(%s): %d" % (sys.argv[1], fibonacci(int(sys.argv[1])))