#include <bits/stdc++.h>
using namespace std;
 
int n;
vector<vector<int>> edges;
vector<int> dist;
queue<int> to_visit;
 
int bfs(int u)
{
    dist.assign(1 + n, 0);
    dist[u] = 1;
    to_visit.push(u);
    while (!to_visit.empty()) {
        u = to_visit.front();
        to_visit.pop();
        for (int v: edges[u]) {
            if (dist[v] == 0) {
                dist[v] = dist[u] + 1;
                to_visit.push(v);
            }
        }
    }
    return *max_element(dist.begin(), dist.end());
}
 
int main()
{
    cin >> n;
    edges.assign(1 + n, vector<int>());
    for (int u = 1; u <= n; ++u) {
        int m;
        cin >> m;
        for (int j = 0; j < m; ++j) {
            int v;
            cin >> v;
            edges[u].push_back(v);
        }
    }
    int answer = 0;
    for (int u = 1; u <= n; ++u) {
        answer = max(answer, bfs(u));
    }
    cout << answer << endl;
    return 0;
}

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0
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0
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0
0
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