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#include <bits/stdc++.h>

using namespace std;

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int n, floor_size, input;
    cin >> n >> floor_size;

    vector<vector<int>> required(n);
    vector<vector<int>> scr(n);
    required[0].resize(floor_size, -1);
    scr[0].resize(floor_size, 0);
    for(int i=1;i<n;i++) {
        cin >> floor_size;
        required[i].reserve(floor_size);
        for(int j=0;j<floor_size;j++) {
            cin >> input;
            required[i].push_back(input-1);
        }
        scr[i].resize(floor_size, 0);
    }

    int floor_scr, absolute_peak = 0;
    for(int i=n-1;i>=0;i--) {
        floor_scr = 0;
        for(int j=0;j<scr[i].size();j++) {
            scr[i][j] = max(scr[i][j], 1);
            floor_scr += scr[i][j];
            if(required[i][j] != -1) {
                scr[i-1][required[i][j]] += scr[i][j];
            }
        }
        absolute_peak = max(absolute_peak, floor_scr);
    }

    cout << absolute_peak << endl;
    return 0;
}