from itertools import combinations

n, m = map(int, input().split())
adj = [[False] * n for _ in range(n)]
for _ in range(m):
    a, b = map(int, input().split())
    adj[a][b] = adj[b][a] = True

result = 0
if n >= 4:
    for quad in combinations(range(n), 4):
        valid = True
        for u in quad:
            cnt = 0
            for v in quad:
                if u != v and adj[u][v]:
                    cnt += 1
            if cnt != 2:
                valid = False
                break
        if valid:
            result += 1
print(result)