n, m = map(int, input().split())
d = {}
for _ in range(m):
    g, r = map(int, input().split())
    d[g] = set(map(int, input().split()))
for s in d.values():
    s &= set(d)
while d:
    k = min(d, key=lambda x: len(d[x]))
    if len(d[k]) > 0:
        break
    for s in d.values():
        s.discard(k)
    del d[k]
print(n - len(d))