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

#define vve vector<vector<event>>
struct event {
    int prev = 0;
    int count = 0;
};

vve input(int n) {
    vve days(n);
    int f;
    cin >> f;
    days[0].resize(f);
    for(int i=1; i<n; i++) {
        int m;
        cin >> m;
        days[i].resize(m);
        for(int j=0; j<m; j++)
            cin >> days[i][j].prev;
    }
    return days;
}
int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);

    int n;
    cin >> n;
    vve days = input(n);

    int result = 0;
    for(int i=n-1; i>=0; i--) {
        int total = 0;
        for(int j=0; j<days[i].size(); j++) {
            days[i][j].count = max(days[i][j].count, 1);
            total += days[i][j].count;
            if(days[i][j].prev != 0)
                days[i-1][days[i][j].prev-1].count += days[i][j].count;
        }
        result = max(result, total);
    }
    cout << result << "\n";

    return 0;
}