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#include <cstdio>
int main ()
{
  int n, k, a, b=2019;
  scanf ("%d%d", &n, &k);
  for (int i=1; i<=n; i++)
  for (int j=1; j<=i; j++)
  {
    scanf ("%d", &a);
    if ((i-j+1)*j <= k && a < b) b = a;
  }
  printf ("%d\n", b);
  return 0;
}