#include <iostream>
#include <vector>

int main()
{
    std::ios_base::sync_with_stdio(false);
    std::cin.tie(NULL);
    
    int n; std::cin >> n;
    std::vector<int> graph[n];
    for (int i = 0; i < n; i++)
    {
        int r; std::cin >> r;
        for (int j = 0; j < r; j++)
        {
            int l; std::cin >> l;
            graph[i].push_back(l - 1);
        }
    }

    int A[n]; for (int i = 0; i < n; i++) { A[i] = 0; }
    
    int result = 0;
    bool next = true;
    int current; int temp;
    while (next)
    {
        result++;

        current = 0;
        while (graph[current].size() != 0)
        {
            temp = current;
            current = graph[current][A[current]];
            A[temp] = (A[temp] + 1) % graph[temp].size();
        }
        
        next = false;
        for (int i = 0; i < n; i++)
            if (A[i] != 0) { next = true; break; }
    }

    std::cout << result;

    return 0;
}