#include <bits/stdc++.h>
#include <atcoder/all>
#pragma GCC target ("avx")
#pragma GCC optimize("O3")
//#pragma GCC optimize("unroll-loops")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
using namespace std;
using namespace atcoder;
using ll=long long;
#define rep(i,a,b) for(int i=(int)(a);i<=(int)b;i++)
#define nrep(i,a,b) for(int i=(int)(a);i>=(int)b;i--)
#define all(v) v.begin(), v.end()
#define rall(v) v.rbegin(), v.rend()
#define moda 998244353LL
#define modb 1000000007LL
#define gyaku 166374059LL
#define dai 2500000000000000000LL
#define tyu 2500000000
#define giri 1000000000
#define en 3.14159265358979
#define endl '\n'
#define sho -dai
#define eps 1e-14
#define yn(x) cout<<(x ? "Yes\n":"No\n");
#define YN(x) cout<<(x ? "YES\n":"NO\n");
#define cou(x) cout<<x<<endl;
#define ci(x) cin>>x;
using it=long long;
using un=unsigned long long;
using db=long double;
using st=string;
using ch=char;
using bo=bool;
using P=pair<it,it>;
using ip=pair<int,int>;
using mint=modint;
using mints=modint998244353;
using minto=modint1000000007;
using vi=vector<it>;
using ivi=vector<int>;
using vd=vector<db>;
using vs=vector<st>;
using vc=vector<ch>;
using vb=vector<bo>;
using vp=vector<P>;
using ivp=vector<ip>;
using vm=vector<mint>;
using vms=vector<mints>;
using vmo=vector<minto>;
using sp=set<P>;
using isp=set<ip>;
using ss=set<st>;
using sc=set<ch>;
using si=set<it>;
using isi=set<int>;
using svi=set<vi>;
using vvi=vector<vi>;
using ivvi=vector<ivi>;
using vvd=vector<vd>;
using vvs=vector<vs>;
using vvb=vector<vb>;
using vvc=vector<vc>;
using vvp=vector<vp>;
using ivvp=vector<ivp>;
using vvm=vector<vm>;
using vvms=vector<vms>;
using vvmo=vector<vmo>;
using vsi=vector<si>;
using ivsi=vector<isi>;
using vsp=vector<sp>;
using ivsp=vector<isp>;
using vvsi=vector<vsi>;
using ivvsi=vector<ivsi>;
using vvsp=vector<vsp>;
using ivvsp=vector<ivsp>;
using vvvi=vector<vvi>;
using ivvvi=vector<ivvi>;
using vvvd=vector<vvd>;
using vvvm=vector<vvm>;
using vvvvi=vector<vvvi>;
using ivvvvi=vector<ivvvi>;

template<typename T>
void scan(vector<T> &a){
  rep(i,0,a.size()-1)cin>>a[i];
}

int haba(ivvi &g,int r,int c,int x,int y,int a,int b){
  ivvi dist(r,ivi(c,-1));dist[x][y]=g[x][y];
  deque<ip> que;que.push_back({x,y});
  while(que.size()){
    int x=que.front().first,y=que.front().second;que.pop_front();
    if(x&&dist[x-1][y]==-1){
      dist[x-1][y]=dist[x][y]+g[x-1][y];
      if(g[x-1][y])que.push_back({x-1,y});
      else que.push_front({x-1,y});
    }
    if(x!=r-1&&dist[x+1][y]==-1){
      dist[x+1][y]=dist[x][y]+g[x+1][y];
      if(g[x+1][y])que.push_back({x+1,y});
      else que.push_front({x+1,y});
    }
    if(y&&dist[x][y-1]==-1){
      dist[x][y-1]=dist[x][y]+g[x][y-1];
      if(g[x][y-1])que.push_back({x,y-1});
      else que.push_front({x,y-1});
    }
    if(y!=c-1&&dist[x][y+1]==-1){
      dist[x][y+1]=dist[x][y]+g[x][y+1];
      if(g[x][y+1])que.push_back({x,y+1});
      else que.push_front({x,y+1});
    }
  }
  return dist[a][b];
}

int main(){
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
  int n,m,k;cin>>n>>m>>k;
  ivvi a(n,ivi(m));
  rep(i,0,n-1)
    rep(j,0,m-1)cin>>a[i][j];
  int ok=1,ng=giri+1;
  while(ng-ok>1){
    int mid=(ng+ok)/2;
    ivvi g(n,ivi(m));
    rep(i,0,n-1)
      rep(j,0,m-1)
        g[i][j]=(a[i][j]<mid);
    if(haba(g,n,m,0,0,n-1,m-1)>k)ng=mid;
    else ok=mid;
  }
  cout<<ok<<endl;
}