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#include <iostream>
using namespace std;

int main()
{
	int n, k, row = 1, col = 1, minYear = 2019, Year;
	cin >> n >> k;

	for (int i = 0; i < n * (n + 1) / 2; i++)
	{
		if (col > row)
		{
			row++;
			col = 1;
		}
		cin >> Year;

		if (col * (row - col + 1) <= k)
			if (Year < minYear)
				minYear = Year;
		col++;
	}

	cout << minYear;

	return 0;
}