#include<bits/stdc++.h>
using namespace std;

#define rep(i,n) for(int i=0;i<(int)(n);i++)
#define ALL(v) v.begin(),v.end()
typedef long long ll;
template <class T> using V=vector<T>;
template <class T> using VV=V<V<T>>;

int dh[]={1,0,-1,0};
int dw[]={0,1,0,-1};
 
int main(){
  ios::sync_with_stdio(false);
  std::cin.tie(nullptr);
  
  int n,m,k;
  cin>>n>>m>>k;
  VV<int> A(n,V<int>(m));
  rep(i,n) rep(j,m) cin>>A[i][j];
  
  int ok=0,ng=1e9+1;
  while(ng-ok>1){
    int mid=(ok+ng)/2;
    VV<int> B(n,V<int>(m)),dis(n,V<int>(m,-1));
    rep(i,n) rep(j,m){
      if(A[i][j]<mid) B[i][j]=1;
    }
    dis[0][0]=0;
    if(B[0][0]) dis[0][0]=1;
    queue<pair<int,int>> que;
    que.push({0,0});
    while(que.size()){
      auto a=que.front(); que.pop();
      int i=a.first,j=a.second;
      rep(k,4){
        int ni=i+dh[k],nj=j+dw[k];
        if(ni<0 || nj<0 || ni>=n || nj>=m) continue;
        if(B[ni][nj]){
          if(dis[ni][nj]==-1){
            dis[ni][nj]=dis[i][j]+1;
            que.push({ni,nj});
          }
          else if(dis[ni][nj]>dis[i][j]+1){
            dis[ni][nj]=dis[i][j]+1;
            que.push({ni,nj});
          }
        }
        else{
          if(dis[ni][nj]==-1){
            dis[ni][nj]=dis[i][j];
            que.push({ni,nj});
          }
          else if(dis[ni][nj]>dis[i][j]){
            dis[ni][nj]=dis[i][j];
            que.push({ni,nj});
          }
        }
      }
    }
    if(dis[n-1][m-1]<=k) ok=mid;
    else ng=mid;
  }
  cout<<ok<<endl;
    
  return 0;
}