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/******************************************************************************

                              Online C++ Compiler.
               Code, Compile, Run and Debug C++ program online.
Write your code in this editor and press "Run" button to compile and execute it.

*******************************************************************************/

#include <iostream>
#include <vector>
#include <unordered_set>

using namespace std;

void zasymuluj(vector<vector<int>>& v, vector<int>& stan, unordered_set<int>& tasmy_nz) {
    int curr = 0;
    while(1) {
        if(v[curr].size() == 0) break;
        
        int next = v[curr][stan[curr]];
        stan[curr] = (stan[curr] + 1) % v[curr].size();
        
        if(stan[curr] == 0) {
            tasmy_nz.erase(curr);
        } else {
            tasmy_nz.insert(curr);
        }
        curr = next;
    }
}

int solve(vector<vector<int>>& v) {
    int nr_walizki = 1;
    unordered_set<int> tasmy_nz;
    
    vector<int> stan(v.size(), 0);
    while(1) {
        zasymuluj(v, stan, tasmy_nz);
        if(tasmy_nz.size() == 0) break;
        nr_walizki++;
    }
    return nr_walizki;
}


int main()
{
    int n;
    cin >> n;
    int m;
    
    vector<vector<int>> v(n);
    for(int i = 0; i < n; i++) {
        cin >> m;
        v[i].resize(m);
        for(int j = 0; j < m; j++) {
            cin >> v[i][j];
            v[i][j]--;
        }
    }
    
    cout << solve(v) << endl;
    

    return 0;
}