# 5 1 2 simple recursion
#
# This header (above) means:
# (a) A correct grade is worth 5 points.
# (b) An inccorect grade is worth 1 point.
# (c) Students have 2 chances to submit their solutions.
#

def fib(n):
	if n < 2:
		return ?
	else:
		return ?

