public static void main ( String [ ] args ) {
  Scanner scn = new Scanner ( System . in ) ;
  int n = scn . nextInt ( ) ;
  double [ ] arr = new double [ n ] ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    arr [ i ] = scn . nextDouble ( ) ;
  }
  Arrays . sort ( arr ) ;
  double res = 1 ;
  double add = 0 ;
  double max = 0 ;
  for ( int i = n - 1 ;
  i >= 0 ;
  i -- ) {
    double b = arr [ i ] ;
    res = res * ( ( double ) 1 - b ) ;
    if ( ! ( arr [ i ] < 1.0 ) ) {
      max = 1.0 ;
      break ;
    }
    double bs = arr [ i ] / ( 1 - arr [ i ] ) ;
    add = add + bs ;
    if ( res * ( add ) > max ) {
      max = res * add ;
    }
  }
  System . out . printf ( "%.10f\n" , max ) ;
}

public static void main ( String [ ] args ) { Scanner scn = new Scanner ( System . in ) ; int n = scn . nextInt ( ) ; double [ ] arr = new double [ n ] ; for ( int i = 0 ; i < n ; i ++ ) { arr [ i ] = scn . nextDouble ( ) ; } Arrays . sort ( arr ) ; double res = 1 ; double add = 0 ; double max = 0 ; for ( int i = n - 1 ; i >= 0 ; i -- ) { double b = arr [ i ] ; res = res * ( ( double ) 1 - b ) ; if ( ! ( arr [ i ] < 1.0 ) ) { max = 1.0 ; break ; } double bs = arr [ i ] / ( 1 - arr [ i ] ) ; add = add + bs ; if ( res * ( add ) > max ) { max = res * add ; } } System . out . printf ( " % .10f \n " , max ) ; }
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