#include <bits/stdc++.h>

using i64 = long long;
using u64 = unsigned long long;
using u32 = unsigned;

using u128 = unsigned __int128;
using i128 = __int128;

int main() {
    std::ios::sync_with_stdio(false);
    std::cin.tie(nullptr);
    
    int k, n1;
    std::cin >> k >> n1;
    
    std::vector<int> s(n1);
    
    std::vector<int> f(k);
    
    for (int i = 1; i < k; i++) {
        int n;
        std::cin >> n;
        
        std::vector<int> ns(n);
        std::vector<bool> vis(s.size());
        for (int j = 0; j < n; j++) {
            int a;
            std::cin >> a;
            a--;
            if (a >= 0) {
                ns[j] = s[a];
                vis[a] = true;
            } else {
                ns[j] = i;
            }
        }
        for (int j = 0; j < s.size(); j++) {
            if (!vis[j]) {
                f[s[j]]++;
                f[i]--;
            }
        }
        s = std::move(ns);
    }
    
    for (auto x : s) {
        f[x]++;
    }
    
    for (int i = 1; i < k; i++) {
        f[i] += f[i - 1];
    }
    
    const int ans = *std::max_element(f.begin(), f.end());
    std::cout << ans << "\n";
    
    return 0;
}