public static void main ( String [ ] args ) {
  Scanner scanner = new Scanner ( System . in ) ;
  int n = scanner . nextInt ( ) ;
  long [ ] [ ] dist = new long [ n + 1 ] [ n + 1 ] ;
  for ( int i = 1 ;
  i <= n ;
  ++ i ) {
    for ( int j = 1 ;
    j <= n ;
    ++ j ) {
      long a = scanner . nextInt ( ) ;
      dist [ i ] [ j ] = a ;
    }
  }
  long totalLength = 0 ;
  for ( int i = 1 ;
  i <= n ;
  ++ i ) {
    for ( int j = i + 1 ;
    j <= n ;
    ++ j ) {
      boolean isNecessary = true ;
      for ( int k = 1 ;
      k <= n ;
      ++ k ) {
        if ( i == k || j == k ) {
          continue ;
        }
        if ( dist [ i ] [ k ] + dist [ k ] [ j ] < dist [ i ] [ j ] ) {
          System . out . println ( - 1 ) ;
          return ;
        }
        else if ( dist [ i ] [ k ] + dist [ k ] [ j ] == dist [ i ] [ j ] ) {
          isNecessary = false ;
          break ;
        }
      }
      if ( isNecessary ) {
        totalLength += dist [ i ] [ j ] ;
      }
    }
  }
  System . out . println ( totalLength ) ;
}

public static void main ( String [ ] args ) { Scanner scanner = new Scanner ( System . in ) ; int n = scanner . nextInt ( ) ; long [ ] [ ] dist = new long [ n + 1 ] [ n + 1 ] ; for ( int i = 1 ; i <= n ; ++ i ) { for ( int j = 1 ; j <= n ; ++ j ) { long a = scanner . nextInt ( ) ; dist [ i ] [ j ] = a ; } } long totalLength = 0 ; for ( int i = 1 ; i <= n ; ++ i ) { for ( int j = i + 1 ; j <= n ; ++ j ) { boolean isNecessary = true ; for ( int k = 1 ; k <= n ; ++ k ) { if ( i == k || j == k ) { continue ; } if ( dist [ i ] [ k ] + dist [ k ] [ j ] < dist [ i ] [ j ] ) { System . out . println ( - 1 ) ; return ; } else if ( dist [ i ] [ k ] + dist [ k ] [ j ] == dist [ i ] [ j ] ) { isNecessary = false ; break ; } } if ( isNecessary ) { totalLength += dist [ i ] [ j ] ; } } } System . out . println ( totalLength ) ; }
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(identifier)) name: (identifier) arguments: (argument_list (identifier))))))