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// Online C++ Compiler - Build, Compile and Run your C++ programs online in your favorite browser

#include<iostream>
#include<vector>

int main()
{
    int k;
    int n1;
    std::cin >> k >> n1;
    std::vector < std::vector <int> > V(k);
    std::vector < std::vector <int> > S(k);
    for (int i = 0; i < n1; i++) {
        V[0].push_back(0);
        S[0].push_back(0);
    }
    for (int i = 1; i <= k - 1; i++){
        int n;
        std::cin >> n;
        while(n--){
            int a;
            std::cin >> a;
            V[i].push_back(a);
            S[i].push_back(0);
        }
    }
    int maks = 0;
    for (int i = k - 1; i >= 0; i--) {
        int suma = 0;
        for (int j = 0; j < S[i].size(); j++) {
            if(S[i][j] == 0) {
                S[i][j] = 1;
            }
            suma += S[i][j];
            if(V[i][j] != 0) {
                S[i-1][V[i][j]-1] += S[i][j];
            }
        }
        maks = std::max(maks, suma);
    }
    std::cout << maks << '\n';
}