public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int n = sc . nextInt ( ) ;
  int a [ ] = new int [ n ] ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) a [ i ] = sc . nextInt ( ) ;
  boolean ok = false ;
  for ( int len = n ;
  len > 0 ;
  len /= 2 ) {
    for ( int c = 0 ;
    c < n ;
    c += len ) {
      boolean sorted = true ;
      for ( int i = 1 ;
      i < len ;
      ++ i ) if ( a [ c + i ] < a [ c + i - 1 ] ) sorted = false ;
      if ( sorted ) {
        System . out . println ( len ) ;
        ok = true ;
        break ;
      }
    }
    if ( ok ) break ;
  }
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int n = sc . nextInt ( ) ; int a [ ] = new int [ n ] ; for ( int i = 0 ; i < n ; i ++ ) a [ i ] = sc . nextInt ( ) ; boolean ok = false ; for ( int len = n ; len > 0 ; len /= 2 ) { for ( int c = 0 ; c < n ; c += len ) { boolean sorted = true ; for ( int i = 1 ; i < len ; ++ i ) if ( a [ c + i ] < a [ c + i - 1 ] ) sorted = false ; if ( sorted ) { System . out . println ( len ) ; ok = true ; break ; } } if ( ok ) break ; } }
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