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#include <iostream>
#include <vector>
#include <ctime>
#include <cmath>
#include <string>


int main(int argc, char* argv[]) {
    bool debug = (argc >= 2 && std::string(argv[1]) == "--debug");
    int k, n;
    std::cin >> k >> n;
    int bestValue = n;
    std::vector<std::vector<int>> inputs(k);
    inputs[0].resize(n, 0);

    for (int i = 1; i < k; ++i) {
        int x;
        std::cin >> x;
        inputs[i].resize(x);
        for (int j = 0; j < x; ++j) {
            std::cin >> inputs[i][j];
        }
    }

    std::vector<std::vector<int>> values(k);
    for (int i = 0; i < k; ++i) {
        values[i].resize(inputs[i].size()+1, 0);
    }

    for (int x = k - 1; x >= 0; --x) {
        int valueCandidate = 0;
        for (size_t y = 1; y < values[x].size(); ++y) {
            if (values[x][y] == 0) {
                values[x][y] = 1;
                valueCandidate += 1;
            } else {
                valueCandidate += values[x][y];
            }
        }
        if (valueCandidate > bestValue) {
            bestValue = valueCandidate;
        }

        if (x > 0) {
            // przeliczę teraz wartości
            for (size_t y = 0; y < inputs[x].size(); ++y) {
                int col = inputs[x][y];
                values[x - 1][col] += values[x][y+1];
            }
        }
    }

    if (debug) {
        std::cerr << "=== DEBUG: inputs ===" << std::endl;
        for (size_t i = 0; i < inputs.size(); ++i) {
            std::cerr << "inputs[" << i << "]:";
            for (size_t j = 0; j < inputs[i].size(); ++j) {
                std::cerr << " " << inputs[i][j];
            }
            std::cerr << std::endl;
        }
        std::cerr << "=====================" << std::endl;
        std::cerr << "=== DEBUG: values ===" << std::endl;
        for (size_t i = 0; i < values.size(); ++i) {
            std::cerr << "values[" << i << "]:";
            for (size_t j = 0; j < values[i].size(); ++j) {
                std::cerr << " " << values[i][j];
            }
            std::cerr << std::endl;
        }
        std::cerr << "=====================" << std::endl;
    }

    std::cout << bestValue << std::endl;

    return 0;
}