static int findProduct ( int n ) {
  int product = - 1 ;
  int si = factors . size ( ) ;
  for ( int i = 0 ;
  i < si ;
  i ++ ) {
    for ( int j = 0 ;
    j < si ;
    j ++ ) {
      for ( int k = 0 ;
      k < si ;
      k ++ ) {
        int s = factors . get ( i ) + factors . get ( j ) + factors . get ( k ) ;
        if ( Collections . binarySearch ( factors , n - s ) >= 0 ) {
          int p = factors . get ( i ) * factors . get ( j ) * factors . get ( k ) * ( n - s ) ;
          if ( p > product ) {
            product = p ;
          }
        }
      }
    }
  }
  return product ;
}

static int findProduct ( int n ) { int product = - 1 ; int si = factors . size ( ) ; for ( int i = 0 ; i < si ; i ++ ) { for ( int j = 0 ; j < si ; j ++ ) { for ( int k = 0 ; k < si ; k ++ ) { int s = factors . get ( i ) + factors . get ( j ) + factors . get ( k ) ; if ( Collections . binarySearch ( factors , n - s ) >= 0 ) { int p = factors . get ( i ) * factors . get ( j ) * factors . get ( k ) * ( n - s ) ; if ( p > product ) { product = p ; } } } } } return product ; }
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