#include <bits/stdc++.h>
#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
using namespace std;
const int MAX = 1000000000;
int di[4] = {-1, 0, 1, 0};
int dj[4] = {0, -1, 0, 1};
int main() {
  cin.tie(0); cout.tie(0);
  ios::sync_with_stdio(false);
  int N, M, K;
  cin >> N >> M >> K;
  vector<vector<int>> A(N, vector<int>(M));
  for(int i = 0; i < N; i++) {
    for(int j = 0; j < M; j++) {
      cin >> A[i][j];
    }
  }
  if(K >= N + M - 1) {
    cout << MAX << '\n';
  } else {
    int ok = 1, ng = MAX + 1;
    while(ng - ok > 1) {
      int mid = (ok + ng) >> 1;
      vector<vector<int>> dp(N, vector<int>(M, MAX));
      dp[0][0] = A[0][0] < mid;
      deque<pair<int, int>> deq;
      deq.push_back(make_pair(0, 0));
      while(!deq.empty()) {
        int i = deq.front().first;
        int j = deq.front().second;
        deq.pop_front();
        for(int k = 0; k < 4; k++) {
          int ni = i + di[k];
          int nj = j + dj[k];
          if(ni < 0 || ni >= N || nj < 0 || nj >= M) {
            continue;
          }
          if(A[ni][nj] < mid) {
            if(dp[ni][nj] > dp[i][j] + 1) {
              dp[ni][nj] = dp[i][j] + 1;
              deq.push_back(make_pair(ni, nj));
            }
          } else {
            if(dp[ni][nj] > dp[i][j]) {
              dp[ni][nj] = dp[i][j];
              deq.push_front(make_pair(ni, nj));
            }
          }
        }
      }
      if(dp.back().back() <= K) {
        ok = mid;
      } else {
        ng = mid;
      }
    }
    cout << ok << '\n';
  }
  return 0;
}