int1 = lambda x: int(x) - 1

N, M = map(int, input().split())
table = [None] * N
for _ in range(M):
    g, r = map(int, input().split())
    h = set(map(int1, input().split()))
    g -= 1
    table[g] = h

basket = set(i for i, t in enumerate(table) if t is None)
ans = len(basket)
while True:
    for i in range(N):
        if i not in basket:
            if table[i] <= basket:
                basket.add(i)
    if ans == len(basket):
        print(ans)
        break
    else:
        ans = len(basket)