public static void main ( String args [ ] ) {
  Scanner in = new Scanner ( System . in ) ;
  int n = in . nextInt ( ) ;
  int a [ ] = new int [ n + 1 ] ;
  int b [ ] = new int [ n + 1 ] ;
  for ( int i = 1 ;
  i <= n ;
  i ++ ) a [ i ] = in . nextInt ( ) ;
  for ( int i = 1 ;
  i <= n ;
  i ++ ) b [ i ] = in . nextInt ( ) ;
  long a1 = 0 , b1 = 0 , ans = 0 ;
  for ( int i = 1 ;
  i <= n ;
  i ++ ) {
    a1 = a1 | a [ i ] ;
    b1 = b1 | b [ i ] ;
    if ( a1 + b1 > ans ) ans = a1 + b1 ;
  }
  System . out . println ( ans ) ;
}

public static void main ( String args [ ] ) { Scanner in = new Scanner ( System . in ) ; int n = in . nextInt ( ) ; int a [ ] = new int [ n + 1 ] ; int b [ ] = new int [ n + 1 ] ; for ( int i = 1 ; i <= n ; i ++ ) a [ i ] = in . nextInt ( ) ; for ( int i = 1 ; i <= n ; i ++ ) b [ i ] = in . nextInt ( ) ; long a1 = 0 , b1 = 0 , ans = 0 ; for ( int i = 1 ; i <= n ; i ++ ) { a1 = a1 | a [ i ] ; b1 = b1 | b [ i ] ; if ( a1 + b1 > ans ) ans = a1 + b1 ; } System . out . println ( ans ) ; }
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