#include <cstdlib>
#include <cmath>
#include <climits>
#include <cfloat>
#include <map>
#include <set>
#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <sstream>
#include <complex>
#include <stack>
#include <queue>
#include <cstdio>
#include <cstring>
#include <iterator>
#include <bitset>
#include <unordered_set>
#include <unordered_map>
#include <fstream>
#include <iomanip>
//#include <utility>
//#include <memory>
//#include <functional>
//#include <deque>
//#include <cctype>
//#include <ctime>
//#include <numeric>
//#include <list>
//#include <iomanip>

//#if __cplusplus >= 201103L
//#include <array>
//#include <tuple>
//#include <initializer_list>
//#include <forward_list>
//
//#define cauto const auto&
//#else

//#endif

using namespace std;


typedef long long ll;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;

typedef vector<int> vint;
typedef vector<vector<int> > vvint;
typedef vector<long long> vll, vLL;
typedef vector<vector<long long> > vvll, vvLL;

#define VV(T) vector<vector< T > >

template <class T>
void initvv(vector<vector<T> > &v, int a, int b, const T &t = T()){
    v.assign(a, vector<T>(b, t));
}

template <class F, class T>
void convert(const F &f, T &t){
    stringstream ss;
    ss << f;
    ss >> t;
}

#undef _P
#define _P(...) (void)printf(__VA_ARGS__)
#define reep(i,a,b) for(int i=(a);i<(b);++i)
#define rep(i,n) reep((i),0,(n))
#define ALL(v) (v).begin(),(v).end()
#define PB push_back
#define F first
#define S second
#define mkp make_pair
#define RALL(v) (v).rbegin(),(v).rend()
#define DEBUG
#ifdef DEBUG
#define dump(x)  cout << #x << " = " << (x) << endl;
#define debug(x) cout << #x << " = " << (x) << " (L" << __LINE__ << ")" << " " << __FILE__ << endl;
#else
#define dump(x) 
#define debug(x) 
#endif
#define LDcout(x,n) fixed<<setprecision(n)<<x

#define MOD 1000000007LL
#define EPS 1e-8
static const int INF=1<<24;

void mainmain(){
	int n;
	while(cin>>n,n){
		vvll vv;
		initvv(vv,n,n,0LL);
		vvll a=vv,b=vv;
		rep(i,n) rep(j,n) cin>>vv[i][j];
		rep(i,n){
			ll t=LLONG_MAX;
			rep(j,n){
				t=min(t,vv[i][j]);
			}
			rep(j,n) if(vv[i][j]==t) b[i][j]=1;
			t=0;
			rep(j,n){
				t=max(t,vv[j][i]);
			}
			rep(j,n) if(vv[j][i]==t) a[j][i]=1;
		}
		bool f=false;
		ll ans=-10000000;
		rep(i,n){
			rep(j,n){
				if(!f&&a[i][j]&&b[i][j]){
					cout<<vv[i][j]<<endl;
					f=true;
				}
			}
		}
		if(!f){
			cout<<0<<endl;
		}
		else{
			// cout<<ans<<endl;
		}
	}
}


signed main() {
	ios_base::sync_with_stdio(false);
  	cout<<fixed<<setprecision(0);
    mainmain();
}