#!/usr/bin/env python3
# %%
import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines


# %%
N, M = map(int, readline().split())
need_cnt = [0] * (N + 1)
needed_by = [[] for _ in range(N + 1)]
for _ in range(M):
    G, R = map(int, readline().split())
    need_cnt[G] = R
    for h in map(int, readline().split()):
        needed_by[h].append(G)


# %%
buy_list = [i for i, x in enumerate(need_cnt[1:], 1) if x == 0]
answer = 0
while buy_list:
    x = buy_list.pop()
    answer += 1
    for y in needed_by[x]:
        need_cnt[y] -= 1
        if need_cnt[y] == 0:
            buy_list.append(y)

# %%
print(answer)