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#include <bits/stdc++.h>

#define pb push_back

using namespace std;


int main()
{
    ios_base::sync_with_stdio(0);

    int k, n;
    cin >> k >> n;

    int m, a;
    vector<vector<int>> meetings, cnt;
    meetings.pb(vector<int>(n, 0));
    cnt.pb(vector<int>(n, 0));

    for (int i = 1; i < k; ++i) {
        cin >> m;
        meetings.pb(vector<int>(m, 0));
        cnt.pb(vector<int>(m, 0));
        for (int j = 0; j < m; ++j)
        {
            cin >> meetings[i][j];
        }
    }

    int result = 0;

    for (int i = k - 1; i >= 0; --i) {
        int perDay = 0;
        for (int j = 0; j < meetings[i].size(); ++j) {
            if (cnt[i][j] == 0 || i == k - 1) {
                cnt[i][j] = 1;
            }

            if (meetings[i][j] > 0) {
                cnt[i-1][meetings[i][j] - 1] += cnt[i][j];
            }

            perDay += cnt[i][j];
        }

        result = max(perDay, result);
    }

    cout << result;
}