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#include <stdio.h>
#include <math.h> 
using namespace std;

int main()
{
	long result = 2020;
	long n = 0;
	long k = 0;
	long ai = 0;

	scanf("%ld", &n);
	scanf("%ld", &k);
	for (int i = 1; i <= n; i++)
	{
		for (int j = 0; j < i; j++)
		{
			scanf("%ld", &ai);
			if (ai < result)
			{
				int currK = (j + 1)*(i - j);
				if (currK < k)
					result = ai;
			}
		}
	}

	printf("%ld", result);

	return 0;
}