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#include <iostream>
using namespace std;

namespace {
}

int main()
{
  iostream::sync_with_stdio(false);
  cin.tie(nullptr);

  int n, k;
  int res = 9999;
  cin >> n >> k;
  for (int i = 1; i <= n; ++i) {
    for (int j = 1; j <= i; ++j) {
      int y;
      cin >> y;
      int cnt = j * (i - j + 1);
      if (cnt > k) continue;
      res = min(res, y);
    }
  }
  cout << res << endl;

  return 0;
}