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#include <bits/stdc++.h>
using namespace std;

const int maxi = 6e5+9;
int vi = 0;
vector<int> graf[maxi];
vector<int> roots;
vector<int> konf[maxi];
int width[maxi];

int dfs(int w){
    if(graf[w].size() == 0) width[w] = 1;
    else for(int& v : graf[w]){width[w] += dfs(v);}

    return width[w];
}

int main(){
    cin.tie(0);
    cout.tie(0);
    ios_base::sync_with_stdio(0);
    int k, n;
    cin >> k >> n;
    for(int i = 0; i < n; i++){
        roots.push_back(vi);
        konf[1].push_back(vi);
        vi++;
    }

    for(int i = 2; i <= k; i++){
        cin >> n;
        for(int j = 0; j < n; j++){
            int a; cin >> a; a--;
            konf[i].push_back(vi);

            if(a < 0) roots.push_back(vi);
            else graf[konf[i-1][a]].push_back(vi);
            vi++;
        }
    }
    for(int& v : roots){
        dfs(v);
    }

    int wynik = 0;
    for(int i = 1; i <= k; i++){
        int cur = 0;
        for(int j = 0; j < konf[i].size(); j++){
            //cout << konf[i][j] << ' ';
            //cout << width[konf[i][j]] << ' ';
            cur += width[konf[i][j]];
        }
        //cout << endl;
        wynik = max(wynik, cur);
    }

    cout << wynik << endl;
}