def fact(n):
	"""
	Return 1, if n is 1 or below,
	otherwise, return n * fact(n-1).
	"""
	return 1 if n <= 1 else n * fact(n-1)

"""
Shown factorial for i,
where i ranges from 1 to 20.
"""
for i in range(1,21):
	print(i, ": ", fact(i), sep='')