import sys
input = sys.stdin.buffer.readline
sys.setrecursionlimit(10 ** 7)

N, M = map(int, input().split())
G = [[] for _ in range(N)]
deg = [0] * N
for _ in range(M):
    x, p = map(int, input().split())
    x -= 1
    deg[x] += p
    for y in map(int, input().split()):
        G[y - 1].append(x)

ans = 0
que = [i for i, d in enumerate(deg) if d == 0]
while que:
    s = que.pop()
    ans += 1
    for t in G[s]:
        deg[t] -= 1
        if deg[t] == 0:
            que.append(t)
print(ans)