n,m = map(int,input().split())
g = [[] for _ in range(n)]
indegree = [0]*n
for _ in range(m):
    x,_ = map(int,input().split())
    x -= 1
    for r in map(int,input().split()):
        g[r-1].append(x)
        indegree[x] += 1

ans = 0
q = [i for i in range(n) if indegree[i]==0]
while q:
    v = q.pop()
    ans += 1
    for c in g[v]:
        indegree[c] -= 1
        if indegree[c] == 0:
            q.append(c)
print(ans)