N = int(raw_input())
ans = ''
if N >= 50: ans = '000000000000'
else:
	fact = 1
	flag = False
	for i in range(1, N+1):
		fact = fact * i
		if fact >= 1000000000000:
			flag = True
		fact = fact % 1000000000000
	ans = str(fact)
	if flag and len(ans) < 12:
		for i in range(0, 12-len(ans)):
			ans = '0' + ans
print ans