n,m = map(int,input().split())
G = [[] for _ in range(n+1)]
Gnum = [0] * (n+1)
for _ in range(m):
    g,r = map(int,input().split())
    h = list(map(int,input().split()))
    for k in h:
        G[k].append(g)
        Gnum[g] += 1
top = []
ans = 0
for i in range(1,n+1):
    if Gnum[i] == 0:
        top.append(i)
        ans += 1
while top:
    now = top.pop()
    for v in G[now]:
        Gnum[v] -= 1
        if Gnum[v] == 0:
            top.append(v)
            ans += 1
print(ans)