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#include "bits/stdc++.h"

using namespace std;

int tab[2007][2007], dp[2007][2007];

int main() {
  ios_base::sync_with_stdio(0);
  int n, k;
  cin >> n >> k;
  for (int i=1; i<=n; i++) {
    dp[i][1] = dp[i][i] = i;
    for (int j=2; j<i; j++) {
      dp[i][j] = (dp[i-1][j-1] + dp[i-1][j] - dp[i-2][j-1] + 1);
    }
  }
  int res = 2020;
  for (int i=1; i<=n; i++) {
    for (int j=1; j<=i; j++) {
      cin >> tab[i][j];
      if (dp[i][j] <= k) res = min(res, tab[i][j]);
    }
  }
  cout << res << "\n";
}