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#include<iostream>

#define FOR(i, a, b) for(int i=(a); i <= (b); i++)

using namespace std;

typedef long long llint;

int main(void) {
  int n, k;
  cin >> n >> k;
  int a, best;
  best = 2020;
  FOR(i, 1, n) {
    FOR(j, 1, i) {
      cin >> a;
      if ((i+1-j)*j <= k && a < best) best = a;
    }
  }
  cout << best << endl;
  return 0;
}