#include <bits/stdc++.h>
using namespace std;
#define int long long
#define pii pair <int, int>
#define fi first
#define se second
int n, k;
vector <int> adj[5005];
int length[5005], depth[5005];
struct item
{
int u, now;
bool operator <(const item &other) const
{
return now > other.now;
}
};
int ans = 1e18;
void dijk(int u)
{
for (int i = 1; i <= n; i++)
{
length[i] = 0;
depth[i] = 0;
}
length[u] = 1;
depth[u] = 1;
queue <int> q;
q.push(u);
while(q.size())
{
auto tmp = q.front();
q.pop();
for (auto v : adj[tmp])
{
if (depth[v]) continue;
depth[v] = depth[tmp] + 1;
length[v] = length[tmp] + 1;
q.push(v);
}
}
int sum = 0;
for (int i = 1; i <= n; i++)
{
if (length[i] == 0) return;
sum += length[i];
}
ans = min(ans, sum);
}
signed main()
{
cin >> n >> k;
for (int i = 1; i <= n; i++)
{
int sz;
cin >> sz;
for (int j = 1; j <= sz; j++)
{
int x;
cin >> x;
adj[x].push_back(i);
}
}
for (int i = 1; i <= n; i++)
{
dijk(i);
}
cout << ans;
return 0;
}
