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#include <iostream>
int main()
{
	int number_of_bottles_needed;
	int number_of_rows;
	int plaszcz;
	int dane;
	int min = 2020;

	std::cin >> number_of_rows;
	std::cin >> number_of_bottles_needed;
	for (int i = 1; i <= number_of_rows; ++i)
	{
		plaszcz = 0;
		for (int j = 0; j < i; ++j)
		{
			std::cin >> dane;
			if (!(j == float(i) / 2))
			{
				plaszcz += 1 - 2 * (j > (i - 1) / 2);
			}
			if (plaszcz*(i - plaszcz + 1) <= number_of_bottles_needed)
			{
				if (min > dane)
				{
					min = dane;
				}
			}
		}
	}
	std::cout << min;
	return 0;
}