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

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    int N,M,K; cin >> N >> M >> K;
    vector<vector<int>> A(N,vector<int>(M));
    for(auto &h : A) for(auto &w : h) cin >> w;

    int low = 0,high = 1000000001;
    while(high-low > 1){
        int mid = (high+low)/2;
        vector<pair<int,int>> dxy = {{-1,0},{0,1},{1,0},{0,-1}};
        vector<vector<int>> dist(N,vector<int>(M,1001001001));
        if(A.at(0).at(0) < mid) dist.at(0).at(0) = 1;
        else dist.at(0).at(0) = 0;

        deque<pair<int,int>> Q; Q.push_back({0,0});
        while(Q.size()){
            auto [x,y] = Q.front(); Q.pop_front();
            for(auto [dx,dy] : dxy){
                int nx = dx+x,ny = dy+y;
                if(nx < 0 || nx >= N || ny < 0 || ny >= M) continue;
                if(dist.at(nx).at(ny) != 1001001001) continue;
                if(A.at(nx).at(ny) >= mid) dist.at(nx).at(ny) = dist.at(x).at(y),Q.push_front({nx,ny});
                else dist.at(nx).at(ny) = dist.at(x).at(y)+1,Q.push_back({nx,ny});
            }
        }
        if(dist.at(N-1).at(M-1) > K) high = mid;
        else low = mid;
    }
    cout << low << endl;
}