public static void main ( String [ ] args ) {
  long N = sc . nextLong ( ) ;
  ArrayList < Integer > first = new ArrayList < > ( ) ;
  ArrayList < Integer > second = new ArrayList < > ( ) ;
  for ( int i = 1 ;
  ( 1L << i ) - 1 <= N ;
  i ++ ) {
    first . add ( i ) ;
    second . add ( i ) ;
  }
  N -= ( 1L << first . size ( ) ) - 1 ;
  while ( N > 0 ) {
    int a = first . size ( ) + 1 ;
    first . add ( a ) ;
    for ( int i = 0 ;
    ;
    i ++ ) {
      if ( ( 1L << ( i + 1 ) ) > N ) {
        second . add ( i , a ) ;
        N -= ( 1L << ( i ) ) ;
        break ;
      }
    }
  }
  System . out . println ( first . size ( ) * 2 ) ;
  for ( int i = 0 ;
  i < first . size ( ) ;
  i ++ ) {
    System . out . print ( first . get ( i ) + " " ) ;
  }
  for ( int i = 0 ;
  i < first . size ( ) ;
  i ++ ) {
    System . out . print ( second . get ( i ) + ( i == first . size ( ) - 1 ? "\n" : " " ) ) ;
  }
}

public static void main ( String [ ] args ) { long N = sc . nextLong ( ) ; ArrayList < Integer > first = new ArrayList < > ( ) ; ArrayList < Integer > second = new ArrayList < > ( ) ; for ( int i = 1 ; ( 1L << i ) - 1 <= N ; i ++ ) { first . add ( i ) ; second . add ( i ) ; } N -= ( 1L << first . size ( ) ) - 1 ; while ( N > 0 ) { int a = first . size ( ) + 1 ; first . add ( a ) ; for ( int i = 0 ; ; i ++ ) { if ( ( 1L << ( i + 1 ) ) > N ) { second . add ( i , a ) ; N -= ( 1L << ( i ) ) ; break ; } } } System . out . println ( first . size ( ) * 2 ) ; for ( int i = 0 ; i < first . size ( ) ; i ++ ) { System . out . print ( first . get ( i ) + " ▁ " ) ; } for ( int i = 0 ; i < first . size ( ) ; i ++ ) { System . out . print ( second . get ( i ) + ( i == first . size ( ) - 1 ? " \n " : " ▁ " ) ) ; } }
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