#include <bits/stdc++.h>

using namespace std;

using ll = long long;

set<int> s[500];

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    int n, m;
    cin >> n >> m;
    for (int i = 0; i < m; i++) {
        int g, r;
        cin >> g >> r;
        g--;
        for (int j = 0; j < r; j++) {
            int h;
            cin >> h;
            h--;
            s[g].insert(h);
        }
    }

    int ans = 0;
    vector<int> used(n, false);
    while (true) {
        vector<int> v;
        for (int i = 0; i < n; i++) {
            if (!used[i] && s[i].size() == 0) {
                v.push_back(i);
                used[i] = true;
                ans++;
            }
        }

        if (v.empty()) break;

        for (int i : v) {
            for (int j = 0; j < n; j++) {
                if (used[j] || s[j].size() == 0) continue;
                s[j].erase(i);
            }
        }
    }
    cout << ans << endl;
    return 0;
}