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

#define int long long
typedef vector<int>vint;
typedef pair<int,int>pint;
typedef vector<pint>vpint;
#define rep(i,n) for(int i=0;i<(n);i++)
#define reps(i,f,n) for(int i=(f);i<(n);i++)
#define all(v) (v).begin(),(v).end()
#define each(it,v) for(__typeof((v).begin()) it=(v).begin();it!=(v).end();it++)
#define pb push_back
#define fi first
#define se second
template<typename A,typename B>inline void chmin(A &a,B b){if(a>b)a=b;}
template<typename A,typename B>inline void chmax(A &a,B b){if(a<b)a=b;}

int N;
int A[100][100];
bool L[100][100];
bool R[100][100];

signed main(){
    while(cin>>N,N){
        rep(i,N)rep(j,N)cin>>A[i][j];
        memset(L,0,sizeof(L));memset(R,0,sizeof(R));
        rep(i,N){
            int mi=LLONG_MAX;
            rep(j,N)chmin(mi,A[i][j]);
            rep(j,N)L[i][j]=A[i][j]==mi;
        }
        rep(j,N){
            int ma=LLONG_MIN;
            rep(i,N)chmax(ma,A[i][j]);
            rep(i,N)R[i][j]=A[i][j]==ma;
        }
        int ans=0;
        rep(i,N)rep(j,N)if(L[i][j]&&R[i][j])ans=A[i][j];
        cout<<ans<<endl;
    }
    return 0;
}