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#include <cstdio>

using namespace std;

int ile, pro, wyn = 2020, obec;

int main()
{
	scanf ("%d%d", &ile, &pro);
	for (int i = 0; i < ile; i++)
	{
		for (int j = 0; j < i + 1; j++)
		{
			scanf ("%d", &obec);
			if ((i + 1 - j) * (j + 1) <= pro)
			{
				if (obec < wyn)
				{
					wyn = obec;
				}
			}
		}
	}
	printf ("%d", wyn);
	return (0);
}