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#include <bits/stdc++.h>
using namespace std;

int n, k, i, j, a, out;

int main ()
	{
	scanf ("%d%d", &n, &k);
	out = 2020;
	for (i=1; i<=n; i++)
		for (j=1; j<=i; j++)
			{
			scanf ("%d", &a);
			if (j * (i-j+1) <= k)
				out = min(out, a);
			}
	printf ("%d\n", out);
	return 0;
	}