public static void main ( String [ ] args ) {
  Scanner s = new Scanner ( System . in ) ;
  int n = s . nextInt ( ) ;
  int cost = 0 , totalCost = 0 ;
  int [ ] getFrom = new int [ n + 1 ] ;
  int [ ] getTo = new int [ n + 1 ] ;
  Arrays . fill ( getFrom , - 1 ) ;
  Arrays . fill ( getTo , - 1 ) ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    int a = s . nextInt ( ) ;
    int b = s . nextInt ( ) ;
    int c = s . nextInt ( ) ;
    if ( getFrom [ a ] != - 1 || getTo [ b ] != - 1 ) {
      getFrom [ b ] = a ;
      getTo [ a ] = b ;
    }
    else {
      getFrom [ a ] = b ;
      getTo [ b ] = a ;
      cost += c ;
    }
    totalCost += c ;
  }
  System . out . println ( Math . min ( cost , totalCost - cost ) ) ;
  s . close ( ) ;
}

public static void main ( String [ ] args ) { Scanner s = new Scanner ( System . in ) ; int n = s . nextInt ( ) ; int cost = 0 , totalCost = 0 ; int [ ] getFrom = new int [ n + 1 ] ; int [ ] getTo = new int [ n + 1 ] ; Arrays . fill ( getFrom , - 1 ) ; Arrays . fill ( getTo , - 1 ) ; for ( int i = 0 ; i < n ; i ++ ) { int a = s . nextInt ( ) ; int b = s . nextInt ( ) ; int c = s . nextInt ( ) ; if ( getFrom [ a ] != - 1 || getTo [ b ] != - 1 ) { getFrom [ b ] = a ; getTo [ a ] = b ; } else { getFrom [ a ] = b ; getTo [ b ] = a ; cost += c ; } totalCost += c ; } System . out . println ( Math . min ( cost , totalCost - cost ) ) ; s . close ( ) ; }
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