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#include <iostream>
#include <vector>
using namespace std;
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  size_t k, n, a, b = 0, c;
  cin >> k >> n;
  vector< vector< pair< size_t, size_t > > > v(1);
  v[0].resize(n);
  while (--k && cin >> n) {
    v.resize(v.size() + 1);
    while (n--) {
      cin >> a;
      v.back().push_back(make_pair(a, 0));
    }
  }
  k = v.size();
  while (k--) {
    c = 0;
    a = v[k].size();
    while (a--) {
      v[k][a].second += !v[k][a].second;
      c += v[k][a].second;
      if (v[k][a].first)
        v[k - 1][v[k][a].first - 1].second += v[k][a].second;
    }
    b = max(b, c);
  }
  cout << b << '\n';
}