#define _USE_MATH_DEFINES
#include <cstdio>
#include <iostream>
#include <sstream>
#include <fstream>
#include <iomanip>
#include <algorithm>
#include <cmath>
#include <complex>
#include <string>
#include <vector>
#include <list>
#include <queue>
#include <stack>
#include <set>
#include <map>
#include <bitset>
#include <numeric>
#include <limits>
#include <climits>
#include <cfloat>
#include <functional>
#include <iterator>
using namespace std;

int main()
{
    int n, m;
    cin >> n >> m;
    vector<int> cnt(n, 0);
    vector<vector<int> > to(n);
    for(int i=0; i<m; ++i){
        int g, r;
        cin >> g >> r;
        -- g;
        cnt[g] = r;
        for(int i=0; i<r; ++i){
            int h;
            cin >> h;
            -- h;
            to[h].push_back(g);
        }
    }

    int ans = 0;
    queue<int> q;
    for(int i=0; i<n; ++i){
        if(cnt[i] == 0){
            q.push(i);
            ++ ans;
        }
    }
    while(!q.empty()){
        int a = q.front();
        q.pop();
        for(int b : to[a]){
            -- cnt[b];
            if(cnt[b] == 0){
                q.push(b);
                ++ ans;
            }
        }
    }
    cout << ans << endl;

    return 0;
}