n, m = [ int(v) for v in input().split() ]
link_list = [[] for i in range(n)]
link_list2 = []

for i in range(m):
	x, y = [ int(v) for v in input().split() ]
	link_list[x].append(y)
	link_list[y].append(x)
	link_list2.append([x,y])
def connect(length):
	if length == 1:
		outlist = [ [i] for i in range(n) ]
		return outlist
	else:
		templist = connect(length-1)
		outlist = []

		for i in range(len(templist)):
			k = templist[i][-1]
			templist2 = [ (templist[i] + [link_list[k][j]] ) for j in range(len(link_list[k])) ]
			outlist += templist2

		return outlist

anslist = []
anslist2 = []

for i in connect(5):
	if len(set(i)) == 4 and i[0] == i[4]:
		anslist.append(i)

for i in anslist:
	if [i[0], i[2]] not in link_list2 and [i[1], i[3]] not in link_list2:
		if [i[2], i[0]] not in link_list2 and [i[3], i[1]] not in link_list2:
			if sorted(set(i)) not in anslist2:
				anslist2.append(sorted(set(i)))
				
print(len(anslist2))