public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int N = sc . nextInt ( ) ;
  int [ ] [ ] A = new int [ N ] [ N ] ;
  long sum = 0 ;
  for ( int i = 0 ;
  i < N ;
  i ++ ) for ( int j = 0 ;
  j < N ;
  j ++ ) {
    A [ i ] [ j ] = sc . nextInt ( ) ;
    sum += A [ i ] [ j ] ;
  }
  sum /= 2 ;
  for ( int i = 0 ;
  i < N ;
  i ++ ) {
    for ( int j = i + 1 ;
    j < N ;
    j ++ ) {
      for ( int k = 0 ;
      k < N ;
      k ++ ) {
        if ( i == k || j == k ) continue ;
        if ( A [ i ] [ j ] > A [ i ] [ k ] + A [ k ] [ j ] ) {
          System . out . println ( - 1 ) ;
          return ;
        }
        if ( A [ i ] [ j ] == A [ i ] [ k ] + A [ k ] [ j ] ) {
          sum -= A [ i ] [ j ] ;
          break ;
        }
      }
    }
  }
  System . out . println ( sum ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int N = sc . nextInt ( ) ; int [ ] [ ] A = new int [ N ] [ N ] ; long sum = 0 ; for ( int i = 0 ; i < N ; i ++ ) for ( int j = 0 ; j < N ; j ++ ) { A [ i ] [ j ] = sc . nextInt ( ) ; sum += A [ i ] [ j ] ; } sum /= 2 ; for ( int i = 0 ; i < N ; i ++ ) { for ( int j = i + 1 ; j < N ; j ++ ) { for ( int k = 0 ; k < N ; k ++ ) { if ( i == k || j == k ) continue ; if ( A [ i ] [ j ] > A [ i ] [ k ] + A [ k ] [ j ] ) { System . out . println ( - 1 ) ; return ; } if ( A [ i ] [ j ] == A [ i ] [ k ] + A [ k ] [ j ] ) { sum -= A [ i ] [ j ] ; break ; } } } } System . out . println ( sum ) ; }
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