#! c:/python/python.exe
def factor(n):
	if n > 1:
		y = (n-1)*n
		n = n-1
		while n > 1:
			y = (n-1)*y
			n = n-1
		print y

def main(x):
	if x == 'done':
		print "thanks"
	else:
		factor(x)
		x = int(raw_input("input number to find factorial: "))
		main(x)

intro = """
****************************************
* welcome to my factorial program
*
* type "done" with no quotes to quit
****************************************
"""
print intro
main(0)