public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int n = sc . nextInt ( ) ;
  Coordinate [ ] coordinate = new Coordinate [ n ] ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    coordinate [ i ] = new Coordinate ( sc . nextInt ( ) , sc . nextInt ( ) , sc . nextInt ( ) ) ;
  }
  double maxX = 0 ;
  double maxY = 0 ;
  for ( int i = 0 ;
  i < n - 1 ;
  i ++ ) {
    double x1 = coordinate [ i ] . x ;
    double y1 = coordinate [ i ] . y ;
    double cost1 = coordinate [ i ] . cost ;
    for ( int j = i ;
    j < n ;
    j ++ ) {
      double x2 = coordinate [ j ] . x ;
      double y2 = coordinate [ j ] . y ;
      double cost2 = coordinate [ j ] . cost ;
      double midX = Math . abs ( x1 - x2 ) * cost1 / ( cost1 + cost2 ) * cost2 ;
      double midY = Math . abs ( y1 - y2 ) * cost1 / ( cost1 + cost2 ) * cost2 ;
      maxX = Math . max ( maxX , midX ) ;
      maxY = Math . max ( maxY , midY ) ;
    }
  }
  System . out . println ( Math . max ( maxX , maxY ) ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int n = sc . nextInt ( ) ; Coordinate [ ] coordinate = new Coordinate [ n ] ; for ( int i = 0 ; i < n ; i ++ ) { coordinate [ i ] = new Coordinate ( sc . nextInt ( ) , sc . nextInt ( ) , sc . nextInt ( ) ) ; } double maxX = 0 ; double maxY = 0 ; for ( int i = 0 ; i < n - 1 ; i ++ ) { double x1 = coordinate [ i ] . x ; double y1 = coordinate [ i ] . y ; double cost1 = coordinate [ i ] . cost ; for ( int j = i ; j < n ; j ++ ) { double x2 = coordinate [ j ] . x ; double y2 = coordinate [ j ] . y ; double cost2 = coordinate [ j ] . cost ; double midX = Math . abs ( x1 - x2 ) * cost1 / ( cost1 + cost2 ) * cost2 ; double midY = Math . abs ( y1 - y2 ) * cost1 / ( cost1 + cost2 ) * cost2 ; maxX = Math . max ( maxX , midX ) ; maxY = Math . max ( maxY , midY ) ; } } System . out . println ( Math . max ( maxX , maxY ) ) ; }
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