N, M = map(int, input().split())
G = [[] for i in range(N)]
deg = [0] * N
for i in range(M):
    g, r = map(int, input().split())
    g -= 1
    H = list(map(int, input().split()))
    for h in H:
        G[h - 1].append(g)
        deg[g] += 1
        
stack = []
for i in range(N):
    if deg[i] == 0:
        stack.append(i)
        
while stack:
    p = stack.pop()
    for u in G[p]:
        deg[u] -= 1
        if deg[u] == 0:
            stack.append(u)

print(deg.count(0))