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#include <iostream>
using namespace std;

int main() {
  int n, k, x;
  int maks = 2019;
  cin >> n >> k;
  int W = 1;

  for (int i = 1; i <= n; i++){
    for(int j = 1; j <= W; j++) {
      cin >> x;
      if (j*(i - j + 1) <= k)
        if (x < maks)
          maks = x;
    }
    W++;
  }
  cout << maks << endl;
}