#include <iostream>
#include <vector>
#include <queue>
using namespace std;
void DFS(int cur, int parent, const vector<vector<int>>& adjList, vector<long long>& salary) {
salary[cur] = 1;
for (int nxt : adjList[cur]) {
if (nxt == parent) continue;
DFS(nxt, cur, adjList, salary);
salary[cur] += salary[nxt];
}
}
bool makeTree(int start, const vector<vector<int>>& potentialChild, vector<vector<int>>& adjList) {
queue<int> q;
vector<bool> visited(adjList.size()); // adjList.size() == N
q.push(start);
visited[start] = true;
while (!q.empty()) {
int cur = q.front(); q.pop();
for (int nxt : potentialChild[cur]) {
if (!visited[nxt]) {
adjList[cur].push_back(nxt);
adjList[nxt].push_back(cur);
q.push(nxt);
visited[nxt] = true;
}
}
}
for (bool b : visited)
if (!b) return false;
return true;
}
int main()
{
int N; cin >> N;
vector<vector<int>> preferences(N), potentialChild(N);
for (int i = 0, ki; i < N; ++i) {
cin >> ki;
preferences[i].resize(ki);
for (int j = 0; j < ki; ++j) {
cin >> preferences[i][j];
--preferences[i][j];
potentialChild[preferences[i][j]].push_back(i);
}
}
long long minTotal = -1;
for (int root = 0; root < N; ++root) {
if (potentialChild[root].empty()) continue;
vector<vector<int>> adjList(N);
if (!makeTree(root, potentialChild, adjList)) continue;
vector<long long> salary(N, 0);
DFS(root, -1, adjList, salary);
long long total = 0;
for (long long s : salary) total += s;
if (minTotal == -1 || total < minTotal) minTotal = total;
}
cout << minTotal;
}
