import itertools
N,M = map(int, input().split())
inf = 10**3
d = [[inf]*N for _ in range(N)]
for _ in range(M):
    a,b = map(int, input().split())
    d[a-1][b-1] = 1
    d[b-1][a-1] = 1

for i in range(N):
    d[i][i] = 0

for k in range(N):
    for i in range(N):
        for j in range(N):
            d[i][j] = min(d[i][j], d[i][k]+d[k][j])

ans = 0
L = [int(i) for i in range(N)]
for C in itertools.combinations(L, 4):
    flag = True
    for i in range(4):
        temp = []
        for j in range(4):
            if j == i:
                continue
            temp.append(d[C[i]][C[j]])
        temp.sort()
        if temp != [1, 1, 2]:
            flag = False
            break
    if flag:
        ans += 1

print(ans)