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

vector<int> dx={1,0,-1,0},dy={0,1,0,-1};

int main() {

    cin.tie(nullptr);
    ios::sync_with_stdio(false);

    ll N,M,K;
    cin>>N>>M>>K;
    vector<vector<ll>> A(N,vector<ll>(M));
    for(int i=0;i<N;i++)for(int j=0;j<M;j++)cin>>A[i][j];
    ll L=0,R=1e9+1;
    while(R-L>1){
        ll mid=(R+L)/2;
        vector<vector<ll>> DP(N,vector<ll>(M,1e9));
        priority_queue<pair<ll,pair<int,int>>,vector<pair<ll,pair<int,int>>>,greater<pair<ll,pair<int,int>>>> PQ;
        DP[0][0]=(A[0][0]<mid);
        PQ.push({DP[0][0],{0,0}});
        vector<vector<bool>> seen(N,vector<bool>(M,0));
        while(!PQ.empty()){
            ll c=PQ.top().first;
            ll y=PQ.top().second.first;
            ll x=PQ.top().second.second;
            PQ.pop();
            if(seen[y][x])continue;
            seen[y][x]=1;
            for(int d=0;d<4;d++){
                int ny=y+dy[d];
                int nx=x+dx[d];
                if(ny<0||nx<0||ny>=N||nx>=M)continue;
                if(seen[ny][nx])continue;
                ll nc=c+(A[ny][nx]<mid);
                if(DP[ny][nx]<=nc)continue;
                DP[ny][nx]=nc;
                PQ.push({nc,{ny,nx}});
            }
        }
        if(DP[N-1][M-1]<=K)L=mid;
        else R=mid;
    }
    cout<<L<<endl;
}