#include <stdio.h>
#include <set>

using namespace std;

void UnionSets(set<int> &dest, set<int> &source)
{
	for (auto it = source.begin(); it != source.end(); ++it)
		dest.insert(*it);
}

int main()
{
	int N, K;

	while (scanf("%d %d", &N, &K) != EOF)
	{
		int kioskS[N], kioskS_;
		set<int> kioskB[N], kioskB_;

		for (int i = 0; i < N; i++)
		{
			int x;
			scanf("%d", &x);
			kioskS[i] = x;

			for (int j = 0; j < x; j++)
			{
				int brand;
				scanf("%d", &brand);
				kioskB[i].insert(brand);
			}
		}

		long ret = 100000001;

		// ostro mensie
		for (int i = 0; i < N; i++)
		{
			kioskS_ = 0;
			kioskB_.clear();
			for (int j = 0; j < N; j++)
			{
				//UnionSets(kioskB_, kioskB[(i + j) % N]);
				kioskB_.insert(kioskB[(i + j) % N].begin(), kioskB[(i + j) % N].end());
				kioskS_ += kioskS[(i + j) % N];

				if (kioskB_.size() >= K)
				{
					if (ret > kioskS_) {
						ret = kioskS_;
						break;  //skip the rest of the stamnds
					}
				}
			}
		}

		printf("%ld\n", (ret == 100000001 ? -1 : ret));
	}

	return 0;
}