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#include <stdio.h>
#include <map>
#include <vector>
using namespace std;

void print_m(map <int,int> m) {
  for(auto e: m)
    fprintf(stderr, "[%d]: %d, ", e.first, e.second);
  fprintf(stderr, "\n");
}

void print_vv(vector<vector<int>> v){
    for(auto &r: v){
      for(auto &e: r){
        fprintf(stderr, "%d ", e);
      }
      fprintf(stderr, "\n");
    }
}

int main() {
  int k, n;
  scanf("%d %d", &k, &n);
  vector<vector<int>> s(k);
  s[0] = vector<int>(n, 0);
  int m;
  for(int i = 1; i < k; i++){
    scanf("%d", &m);
    s[i] = vector<int>(m, 0);
    for(int j = 0; j < m; j++){
      scanf("%d", &s[i][j]);
    }
  }
//  print_vv(s);
  int ucz = 0;
  map<int,int> prev;
  map<int,int> next;
  for(int i = k-1; i >=0; i--){
    int ucz_local = 0;
    for(int j = 0; j < s[i].size(); j++){
      if(prev[j+1] > 0){
        if(s[i][j] != 0)
          next[s[i][j]] += prev[j+1];
        ucz_local += prev[j+1];
      }
      else{
        if(s[i][j] != 0)
          next[s[i][j]]++;
        ucz_local++;
      }
    }
    if(ucz_local > ucz)
      ucz = ucz_local;
   prev = move(next);
//   print_m(prev);
  }
  printf("%d\n", ucz);
  return 0;
}