import sys
from itertools import combinations

def debug(x, table):
    for name, val in table.items():
        if x is val:
            print('DEBUG:{} -> {}'.format(name, val), file=sys.stderr)
            return None

def solve():
    N, M = map(int, input().split())
    Adj = [[0]*N for i in range(N)]
    cnt = 0

    for lp in range(M):
        a, b = map(int, input().split())
        Adj[a][b] = 1
        Adj[b][a] = 1

    for comb in combinations(range(N), 4):
        for u in comb:
            deg = 0
            for v in comb:
                deg += Adj[u][v]
            if deg != 2:
                break
        else:
            cnt += 1

    print(cnt)

if __name__ == '__main__':
    solve()