n, m = map(int, input().split())
edges = [[] for _ in range(n)]
in_ = [0] * n
for _ in range(m):
    g, r = map(int, input().split())
    g -= 1
    H = list(map(int, input().split()))
    for h in H:
        edges[h - 1].append(g)
        in_[g] += 1

ans = 0
st = []
ans = 0
for i in range(n):
    if in_[i] == 0:
        st.append(i)
        ans += 1
while st:
    pos = st.pop()
    for npos in edges[pos]:
        in_[npos] -= 1
        if in_[npos] == 0:
            ans += 1
            st.append(npos)

print(ans)