#pragma GCC optimize ("Ofast")
#include<bits/stdc++.h>
using namespace std;
void * wmem;
char memarr[ 96000000 ] ;
template < class T> inline void walloc1d( T ** arr, int x, void ** mem = & wmem) {
static int skip[ 16 ] = { 0 , 15 , 14 , 13 , 12 , 11 , 10 , 9 , 8 , 7 , 6 , 5 , 4 , 3 , 2 , 1 } ;
( * mem) = ( void * ) ( ( ( char * ) ( * mem) ) + skip[ ( ( unsigned long long ) ( * mem) ) & 15 ] ) ;
( * arr) = ( T* ) ( * mem) ;
( * mem) = ( ( * arr) + x) ;
}
template < class T> inline void walloc1d( T ** arr, int x1, int x2, void ** mem = & wmem) {
walloc1d( arr, x2- x1, mem) ;
( * arr) - = x1;
}
template < class T1, class T2> void sortA_L( int N, T1 a[ ] , T2 b[ ] , void * mem = wmem) {
int i;
pair< T1, T2> * arr;
walloc1d( & arr, N, & mem) ;
for ( i= ( 0 ) ; i< ( N) ; i++ ) {
arr[ i] .first = a[ i] ;
arr[ i] .second = b[ i] ;
}
sort( arr, arr+ N) ;
for ( i= ( 0 ) ; i< ( N) ; i++ ) {
a[ i] = arr[ i] .first ;
b[ i] = arr[ i] .second ;
}
}
template < class T1, class T2, class T3> void sortA_L( int N, T1 a[ ] , T2 b[ ] , T3 c[ ] , void * mem = wmem) {
int i;
pair< T1, pair< T2, T3> > * arr;
walloc1d( & arr, N, & mem) ;
for ( i= ( 0 ) ; i< ( N) ; i++ ) {
arr[ i] .first = a[ i] ;
arr[ i] .second .first = b[ i] ;
arr[ i] .second .second = c[ i] ;
}
sort( arr, arr+ N) ;
for ( i= ( 0 ) ; i< ( N) ; i++ ) {
a[ i] = arr[ i] .first ;
b[ i] = arr[ i] .second .first ;
c[ i] = arr[ i] .second .second ;
}
}
inline int my_getchar_unlocked( ) {
static char buf[ 1048576 ] ;
static int s = 1048576 ;
static int e = 1048576 ;
if ( s == e && e == 1048576 ) {
e = fread_unlocked( buf, 1 , 1048576 , stdin ) ;
s = 0 ;
}
if ( s == e) {
return EOF ;
}
return buf[ s++ ] ;
}
inline void rd( int & x) {
int k;
int m= 0 ;
x= 0 ;
for ( ;; ) {
k = my_getchar_unlocked( ) ;
if ( k== '-' ) {
m= 1 ;
break ;
}
if ( '0' <= k&& k<= '9' ) {
x= k- '0' ;
break ;
}
}
for ( ;; ) {
k = my_getchar_unlocked( ) ;
if ( k< '0' || k> '9' ) {
break ;
}
x= x* 10 + k- '0' ;
}
if ( m) {
x= - x;
}
}
struct MY_WRITER{
char buf[ 1048576 ] ;
int s;
int e;
MY_WRITER( ) {
s = 0 ;
e = 1048576 ;
}
~MY_WRITER( ) {
if ( s) {
fwrite_unlocked( buf, 1 , s, stdout ) ;
}
}
}
;
MY_WRITER MY_WRITER_VAR;
void my_putchar_unlocked( int a) {
if ( MY_WRITER_VAR.s == MY_WRITER_VAR.e ) {
fwrite_unlocked( MY_WRITER_VAR.buf , 1 , MY_WRITER_VAR.s , stdout ) ;
MY_WRITER_VAR.s = 0 ;
}
MY_WRITER_VAR.buf [ MY_WRITER_VAR.s ++ ] = a;
}
inline void wt_L( char a) {
my_putchar_unlocked( a) ;
}
inline void wt_L( int x) {
int s= 0 ;
int m= 0 ;
char f[ 10 ] ;
if ( x< 0 ) {
m= 1 ;
x= - x;
}
while ( x) {
f[ s++ ] = x% 10 ;
x/ = 10 ;
}
if ( ! s) {
f[ s++ ] = 0 ;
}
if ( m) {
my_putchar_unlocked( '-' ) ;
}
while ( s-- ) {
my_putchar_unlocked( f[ s] + '0' ) ;
}
}
template < class S> inline void arrInsert( const int k, int & sz, S a[ ] , const S aval) {
int i;
sz++ ;
for ( i= sz- 1 ; i> k; i-- ) {
a[ i] = a[ i- 1 ] ;
}
a[ k] = aval;
}
template < class S, class T> inline void arrInsert( const int k, int & sz, S a[ ] , const S aval, T b[ ] , const T bval) {
int i;
sz++ ;
for ( i= sz- 1 ; i> k; i-- ) {
a[ i] = a[ i- 1 ] ;
}
for ( i= sz- 1 ; i> k; i-- ) {
b[ i] = b[ i- 1 ] ;
}
a[ k] = aval;
b[ k] = bval;
}
template < class S, class T, class U> inline void arrInsert( const int k, int & sz, S a[ ] , const S aval, T b[ ] , const T bval, U c[ ] , const U cval) {
int i;
sz++ ;
for ( i= sz- 1 ; i> k; i-- ) {
a[ i] = a[ i- 1 ] ;
}
for ( i= sz- 1 ; i> k; i-- ) {
b[ i] = b[ i- 1 ] ;
}
for ( i= sz- 1 ; i> k; i-- ) {
c[ i] = c[ i- 1 ] ;
}
a[ k] = aval;
b[ k] = bval;
c[ k] = cval;
}
template < class S, class T, class U, class V> inline void arrInsert( const int k, int & sz, S a[ ] , const S aval, T b[ ] , const T bval, U c[ ] , const U cval, V d[ ] , const V dval) {
int i;
sz++ ;
for ( i= sz- 1 ; i> k; i-- ) {
a[ i] = a[ i- 1 ] ;
}
for ( i= sz- 1 ; i> k; i-- ) {
b[ i] = b[ i- 1 ] ;
}
for ( i= sz- 1 ; i> k; i-- ) {
c[ i] = c[ i- 1 ] ;
}
for ( i= sz- 1 ; i> k; i-- ) {
d[ i] = d[ i- 1 ] ;
}
a[ k] = aval;
b[ k] = bval;
c[ k] = cval;
d[ k] = dval;
}
struct unionFind{
int * d;
int N;
int M;
inline void malloc ( const int n) {
d = ( int * ) std:: malloc ( n* sizeof ( int ) ) ;
M = n;
}
inline void malloc ( const int n, const int fg) {
d = ( int * ) std:: malloc ( n* sizeof ( int ) ) ;
M = n;
if ( fg) {
init( n) ;
}
}
inline void free ( void ) {
std:: free ( d) ;
}
inline void walloc( const int n, void ** mem= & wmem) {
walloc1d( & d, n, mem) ;
M = n;
}
inline void walloc( const int n, const int fg, void ** mem= & wmem) {
walloc1d( & d, n, mem) ;
M = n;
if ( fg) {
init( n) ;
}
}
inline void init( const int n) {
int i;
N = n;
for ( i= ( 0 ) ; i< ( n) ; i++ ) {
d[ i] = - 1 ;
}
}
inline void init( void ) {
init( M) ;
}
inline int get( int a) {
int t = a;
int k;
while ( d[ t] >= 0 ) {
t= d[ t] ;
}
while ( d[ a] >= 0 ) {
k= d[ a] ;
d[ a] = t;
a= k;
}
return a;
}
inline int connect( int a, int b) {
if ( d[ a] >= 0 ) {
a= get( a) ;
}
if ( d[ b] >= 0 ) {
b= get( b) ;
}
if ( a== b) {
return 0 ;
}
if ( d[ a] < d[ b] ) {
d[ a] + = d[ b] ;
d[ b] = a;
}
else {
d[ b] + = d[ a] ;
d[ a] = b;
}
return 1 ;
}
inline int operator( ) ( int a) {
return get( a) ;
}
inline int operator( ) ( int a, int b) {
return connect( a,b) ;
}
inline int & operator[ ] ( const int a) {
return d[ a] ;
}
inline int size( int a) {
a = get( a) ;
return - d[ a] ;
}
inline int sizeList( int res[ ] ) {
int i;
int sz= 0 ;
for ( i= ( 0 ) ; i< ( N) ; i++ ) {
if ( d[ i] < 0 ) {
res[ sz++ ] = - d[ i] ;
}
}
return sz;
}
}
;
int N;
int A[ 500 ] [ 500 ] ;
int m;
int x[ 200000 ] ;
int y[ 200000 ] ;
int z[ 200000 ] ;
int main( ) {
int i;
wmem = memarr;
int res = 0 ;
unionFind uf;
rd( N) ;
{
int Lj4PdHRW;
int KL2GvlyY;
for ( Lj4PdHRW= ( 0 ) ; Lj4PdHRW< ( N) ; Lj4PdHRW++ ) {
for ( KL2GvlyY= ( 0 ) ; KL2GvlyY< ( N) ; KL2GvlyY++ ) {
rd( A[ Lj4PdHRW] [ KL2GvlyY] ) ;
}
}
}
for ( i= ( 0 ) ; i< ( N) ; i++ ) {
int j;
for ( j= ( i+ 1 ) ; j< ( N) ; j++ ) {
arrInsert( m, m, x, i, y, j, z, A[ i] [ j] ) ;
}
}
sortA_L( m, z, x, y) ;
uf.malloc ( 2 * N,1 ) ;
for ( i= ( 0 ) ; i< ( m) ; i++ ) {
res = z[ i] ;
uf( x[ i] , y[ i] + N) ;
uf( x[ i] + N, y[ i] ) ;
if ( uf( x[ i] ) == uf( x[ i] + N) || uf( y[ i] ) == uf( y[ i] + N) ) {
break ;
}
}
wt_L( res) ;
wt_L( '\n ' ) ;
return 0 ;
}
// cLay version 20201123-1
// --- original code ---
// int N, A[500][500];
// int m, x[2d5], y[2d5], z[2d5];
// {
// int res = 0;
// unionFind uf;
// rd(N,A(N,N));
// rep(i,N) rep(j,i+1,N) arrInsert(m, m, x, i, y, j, z, A[i][j]);
// sortA(m, z, x, y);
// uf.malloc(2*N,1);
// rep(i,m){
// res = z[i];
// uf(x[i], y[i]+N);
// uf(x[i]+N, y[i]);
// if(uf(x[i])==uf(x[i]+N) || uf(y[i])==uf(y[i]+N)) break;
// }
// wt(res);
// }
#pragma GCC optimize ("Ofast")
#include<bits/stdc++.h>
using namespace std;
void*wmem;
char memarr[96000000];
template<class T> inline void walloc1d(T **arr, int x, void **mem = &wmem){
  static int skip[16] = {0, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1};
  (*mem) = (void*)( ((char*)(*mem)) + skip[((unsigned long long)(*mem)) & 15] );
  (*arr)=(T*)(*mem);
  (*mem)=((*arr)+x);
}
template<class T> inline void walloc1d(T **arr, int x1, int x2, void **mem = &wmem){
  walloc1d(arr, x2-x1, mem);
  (*arr) -= x1;
}
template<class T1, class T2> void sortA_L(int N, T1 a[], T2 b[], void *mem = wmem){
  int i;
  pair<T1, T2>*arr;
  walloc1d(&arr, N, &mem);
  for(i=(0);i<(N);i++){
    arr[i].first = a[i];
    arr[i].second = b[i];
  }
  sort(arr, arr+N);
  for(i=(0);i<(N);i++){
    a[i] = arr[i].first;
    b[i] = arr[i].second;
  }
}
template<class T1, class T2, class T3> void sortA_L(int N, T1 a[], T2 b[], T3 c[], void *mem = wmem){
  int i;
  pair<T1, pair<T2, T3> >*arr;
  walloc1d(&arr, N, &mem);
  for(i=(0);i<(N);i++){
    arr[i].first = a[i];
    arr[i].second.first = b[i];
    arr[i].second.second = c[i];
  }
  sort(arr, arr+N);
  for(i=(0);i<(N);i++){
    a[i] = arr[i].first;
    b[i] = arr[i].second.first;
    c[i] = arr[i].second.second;
  }
}
inline int my_getchar_unlocked(){
  static char buf[1048576];
  static int s = 1048576;
  static int e = 1048576;
  if(s == e && e == 1048576){
    e = fread_unlocked(buf, 1, 1048576, stdin);
    s = 0;
  }
  if(s == e){
    return EOF;
  }
  return buf[s++];
}
inline void rd(int &x){
  int k;
  int m=0;
  x=0;
  for(;;){
    k = my_getchar_unlocked();
    if(k=='-'){
      m=1;
      break;
    }
    if('0'<=k&&k<='9'){
      x=k-'0';
      break;
    }
  }
  for(;;){
    k = my_getchar_unlocked();
    if(k<'0'||k>'9'){
      break;
    }
    x=x*10+k-'0';
  }
  if(m){
    x=-x;
  }
}
struct MY_WRITER{
  char buf[1048576];
  int s;
  int e;
  MY_WRITER(){
    s = 0;
    e = 1048576;
  }
  ~MY_WRITER(){
    if(s){
      fwrite_unlocked(buf, 1, s, stdout);
    }
  }
}
;
MY_WRITER MY_WRITER_VAR;
void my_putchar_unlocked(int a){
  if(MY_WRITER_VAR.s == MY_WRITER_VAR.e){
    fwrite_unlocked(MY_WRITER_VAR.buf, 1, MY_WRITER_VAR.s, stdout);
    MY_WRITER_VAR.s = 0;
  }
  MY_WRITER_VAR.buf[MY_WRITER_VAR.s++] = a;
}
inline void wt_L(char a){
  my_putchar_unlocked(a);
}
inline void wt_L(int x){
  int s=0;
  int m=0;
  char f[10];
  if(x<0){
    m=1;
    x=-x;
  }
  while(x){
    f[s++]=x%10;
    x/=10;
  }
  if(!s){
    f[s++]=0;
  }
  if(m){
    my_putchar_unlocked('-');
  }
  while(s--){
    my_putchar_unlocked(f[s]+'0');
  }
}
template<class S> inline void arrInsert(const int k, int &sz, S a[], const S aval){
  int i;
  sz++;
  for(i=sz-1;i>k;i--){
    a[i] = a[i-1];
  }
  a[k] = aval;
}
template<class S, class T> inline void arrInsert(const int k, int &sz, S a[], const S aval, T b[], const T bval){
  int i;
  sz++;
  for(i=sz-1;i>k;i--){
    a[i] = a[i-1];
  }
  for(i=sz-1;i>k;i--){
    b[i] = b[i-1];
  }
  a[k] = aval;
  b[k] = bval;
}
template<class S, class T, class U> inline void arrInsert(const int k, int &sz, S a[], const S aval, T b[], const T bval, U c[], const U cval){
  int i;
  sz++;
  for(i=sz-1;i>k;i--){
    a[i] = a[i-1];
  }
  for(i=sz-1;i>k;i--){
    b[i] = b[i-1];
  }
  for(i=sz-1;i>k;i--){
    c[i] = c[i-1];
  }
  a[k] = aval;
  b[k] = bval;
  c[k] = cval;
}
template<class S, class T, class U, class V> inline void arrInsert(const int k, int &sz, S a[], const S aval, T b[], const T bval, U c[], const U cval, V d[], const V dval){
  int i;
  sz++;
  for(i=sz-1;i>k;i--){
    a[i] = a[i-1];
  }
  for(i=sz-1;i>k;i--){
    b[i] = b[i-1];
  }
  for(i=sz-1;i>k;i--){
    c[i] = c[i-1];
  }
  for(i=sz-1;i>k;i--){
    d[i] = d[i-1];
  }
  a[k] = aval;
  b[k] = bval;
  c[k] = cval;
  d[k] = dval;
}
struct unionFind{
  int*d;
  int N;
  int M;
  inline void malloc(const int n){
    d = (int*)std::malloc(n*sizeof(int));
    M = n;
  }
  inline void malloc(const int n, const int fg){
    d = (int*)std::malloc(n*sizeof(int));
    M = n;
    if(fg){
      init(n);
    }
  }
  inline void free(void){
    std::free(d);
  }
  inline void walloc(const int n, void **mem=&wmem){
    walloc1d(&d, n, mem);
    M = n;
  }
  inline void walloc(const int n, const int fg, void **mem=&wmem){
    walloc1d(&d, n, mem);
    M = n;
    if(fg){
      init(n);
    }
  }
  inline void init(const int n){
    int i;
    N = n;
    for(i=(0);i<(n);i++){
      d[i] = -1;
    }
  }
  inline void init(void){
    init(M);
  }
  inline int get(int a){
    int t = a;
    int k;
    while(d[t]>=0){
      t=d[t];
    }
    while(d[a]>=0){
      k=d[a];
      d[a]=t;
      a=k;
    }
    return a;
  }
  inline int connect(int a, int b){
    if(d[a]>=0){
      a=get(a);
    }
    if(d[b]>=0){
      b=get(b);
    }
    if(a==b){
      return 0;
    }
    if(d[a] < d[b]){
      d[a] += d[b];
      d[b] = a;
    }
    else{
      d[b] += d[a];
      d[a] = b;
    }
    return 1;
  }
  inline int operator()(int a){
    return get(a);
  }
  inline int operator()(int a, int b){
    return connect(a,b);
  }
  inline int& operator[](const int a){
    return d[a];
  }
  inline int size(int a){
    a = get(a);
    return -d[a];
  }
  inline int sizeList(int res[]){
    int i;
    int sz=0;
    for(i=(0);i<(N);i++){
      if(d[i]<0){
        res[sz++] = -d[i];
      }
    }
    return sz;
  }
}
;
int N;
int A[500][500];
int m;
int x[200000];
int y[200000];
int z[200000];
int main(){
  int i;
  wmem = memarr;
  int res = 0;
  unionFind uf;
  rd(N);
  {
    int Lj4PdHRW;
    int KL2GvlyY;
    for(Lj4PdHRW=(0);Lj4PdHRW<(N);Lj4PdHRW++){
      for(KL2GvlyY=(0);KL2GvlyY<(N);KL2GvlyY++){
        rd(A[Lj4PdHRW][KL2GvlyY]);
      }
    }
  }
  for(i=(0);i<(N);i++){
    int j;
    for(j=(i+1);j<(N);j++){
      arrInsert(m, m, x, i, y, j, z, A[i][j]);
    }
  }
  sortA_L(m, z, x, y);
  uf.malloc(2*N,1);
  for(i=(0);i<(m);i++){
    res = z[i];
    uf(x[i], y[i]+N);
    uf(x[i]+N, y[i]);
    if(uf(x[i])==uf(x[i]+N) || uf(y[i])==uf(y[i]+N)){
      break;
    }
  }
  wt_L(res);
  wt_L('\n');
  return 0;
}
// cLay version 20201123-1

// --- original code ---
// int N, A[500][500];
// int m, x[2d5], y[2d5], z[2d5];
// {
//   int res = 0;
//   unionFind uf;
//   rd(N,A(N,N));
//   rep(i,N) rep(j,i+1,N) arrInsert(m, m, x, i, y, j, z, A[i][j]);
//   sortA(m, z, x, y);
//   uf.malloc(2*N,1);
//   rep(i,m){
//     res = z[i];
//     uf(x[i], y[i]+N);
//     uf(x[i]+N, y[i]);
//     if(uf(x[i])==uf(x[i]+N) || uf(y[i])==uf(y[i]+N)) break;
//   }
//   wt(res);
// }
