This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
// IOI 2021
#include <bits/stdc++.h>
using namespace std;
#define endl '\n'
#define ends ' '
#define die(x) return cout << x << endl, 0
#define all(v) v.begin(), v.end()
#define sz(x) (int)(x.size())
void debug_out() { cerr << endl; }
template <typename Head, typename... Tail>
void debug_out(Head H, Tail... T) { cerr << ends << H; debug_out(T...); }
#define debug(...) cerr << "{" << #__VA_ARGS__ << "}:", debug_out(__VA_ARGS__)
typedef long long ll;
typedef pair<int, int> pii;
const int INF = 1e9;
const ll MOD = 1e9 + 7;
////////////////////////////////////////////////////////////////////
const int N = 5e3 + 2;
int n, D[N];
vector<int> G[N];
queue<int> Q;
int BFS(int r) {
fill(D, D + N, N); D[r] = 1;
Q.push(r);
while (!Q.empty()) {
int v = Q.front(); Q.pop();
for (int u : G[v]) if (D[v] + 1 < D[u]) D[u] = D[v] + 1, Q.push(u);
}
int sum = 0;
for (int i = 1; i <= n; i++) sum += D[i];
return sum;
}
int main() {
ios::sync_with_stdio(0), cin.tie(0), cout.tie(0);
mt19937 Rnd(time(0));
cin >> n;
for (int i = 1; i <= n; i++) {
int k; cin >> k;
while (k--) {
int p; cin >> p;
G[p].push_back(i);
}
}
int ans = N * N;
for (int i = 1; i <= n; i++) ans = min(ans, BFS(i));
cout << ans << endl;
return 0;
}
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