#include <bits/stdc++.h>

using namespace std;

int k, n, a, tmp, ans;
vector<vector<pair<int, int>>> vec;

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);

    cin >> k >> n;

    vec.resize(k);

    for (int i = 0; i < n; ++i) {
        vec[0].push_back({0, 0});
    }

    for (int i = 1; i < k; ++i) {
        cin >> n;

        for (int j = 0; j < n; ++j) {
            cin >> a;
            vec[i].push_back({a, 0});
        }
    }

    for (int i = k - 1; i >= 0; --i) {
        tmp = (int)vec[i].size();

        for (auto j : vec[i]) {
            if (j.second > 1) {
                tmp += (j.second - 1);
            }

            if (i > 0 && j.first > 0) {
                vec[i - 1][j.first - 1].second += max(1, j.second);
            }
        }

        ans = max(ans, tmp);
    }

    cout << ans << '\n';
}