def main():
	str_list = []
	a = int(input())
	for i in range(a):
		str_list.append(input())
	check_list = [txt1+txt2 for i, txt1 in enumerate(str_list) for j, txt2 in enumerate(str_list) if i is not j]
	s = set(check_list)
	print(len(list(s)))

if __name__ == "__main__":
    main()