N,M = map(int,input().split())
E = [[] for _ in range(N)]
D = [0] * N
for i in range(M):
    g,r = map(int,input().split())
    g -= 1
    D[g] = r
    for h in list(map(int,input().split())):
        h -= 1
        E[h].append(g)

Q = []
for i in range(N):
    if D[i] == 0:
        Q.append(i)
while Q:
    x = Q.pop()
    for y in E[x]:
        D[y] -= 1
        if D[y] == 0:
            Q.append(y)
    E[x] = []
print(N-sum(D))