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#include <cstdio>
#include <algorithm>

using namespace std;

int main()
{
  int n, k;

  scanf("%d%d", &n, &k);

  int ret = 1000000;

  for (int i = 1; i <= n; i++)
  {
    for (int j = 1; j <= i; j++)
    {
       int a;
       scanf("%d", &a);
       int r = j * (i - j + 1);
       if (r <= k)
         ret = min(ret, a);
    }
  }

  printf("%d\n", ret);

  return 0;
}