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#include <stdio.h>

int main() 
{
	int n, k, i, j, x, y, z, r, w;


	while (scanf("%d%d", &n, &k)==2)
	{
		w	= 3000;
		for (i=1; i<=n; i++)
		{
			x	= 1;
			y	= i;

			for (j=1; j<=i; j++)
			{
				scanf("%d", &r);
				if (r<w && x*y<=k)
					w	= r;

				x++;
				y--;
			}
		}

		printf("%d\n", w);			
	}

	return 0;
}