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#include <iostream>

using namespace std;

int main()
{
	int n, k, bottlesInRow = 1, currentBottle, bestBottle = 2019;
	cin >> n >> k;

	for (int j = 0; j < n; ++j)
	{
		for (int i = 1; i <= bottlesInRow; ++i)
		{
			cin >> currentBottle;
			if (currentBottle < bestBottle)
			{
				if ((bottlesInRow - i + 1) * (bottlesInRow - (bottlesInRow - i)) <= k)
					bestBottle = currentBottle;
			}
		}
	++bottlesInRow;
	}

	cout << bestBottle << endl;

	return 0;
}