#include <bits/stdc++.h>

using namespace std;

#define REP(i,n) for(int i=0; i<(int)(n); i++)

int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);

  int n, m;
  cin >> n >> m;

  vector<int> deg(n);
  vector<vector<int> > edges(n);

  REP (i, m) {
    int g, r;
    cin >> g >> r;
    --g;
    REP (j, r) {
      int h;
      cin >> h;
      --h;
      edges[h].push_back(g);
      deg[g]++;
    }
  }

  queue<int> q;
  REP (i, n) if (deg[i] == 0) q.push(i);
  
  int ret = 0;
  while (!q.empty()) {
    int v = q.front();
    q.pop();
    ++ret;
    for (int w: edges[v])
      if (!--deg[w])
        q.push(w);
  }
  cout << ret << endl;
  
  return 0;
}