public static void main ( String [ ] args ) {
  Scanner scan = new Scanner ( System . in ) ;
  PrintWriter out = new PrintWriter ( System . out ) ;
  int N = scan . nextInt ( ) ;
  int max = 0 ;
  int id = 0 ;
  int max_ ;
  for ( int i = 2 ;
  i <= N ;
  i ++ ) {
    out . printf ( "? %d %d\n" , 1 , i ) ;
    out . flush ( ) ;
    scan = new Scanner ( System . in ) ;
    max_ = scan . nextInt ( ) ;
    if ( max_ > max ) {
      id = i ;
      max = max_ ;
    }
  }
  for ( int i = 2 ;
  i <= N ;
  i ++ ) {
    if ( i != id ) {
      out . printf ( "? %d %d\n" , id , i ) ;
      out . flush ( ) ;
      scan = new Scanner ( System . in ) ;
      max_ = scan . nextInt ( ) ;
      if ( max_ > max ) {
        max = max_ ;
      }
    }
  }
  out . printf ( "! %d\n" , max ) ;
  out . flush ( ) ;
}

public static void main ( String [ ] args ) { Scanner scan = new Scanner ( System . in ) ; PrintWriter out = new PrintWriter ( System . out ) ; int N = scan . nextInt ( ) ; int max = 0 ; int id = 0 ; int max_ ; for ( int i = 2 ; i <= N ; i ++ ) { out . printf ( " ? ▁ % d ▁ % d \n " , 1 , i ) ; out . flush ( ) ; scan = new Scanner ( System . in ) ; max_ = scan . nextInt ( ) ; if ( max_ > max ) { id = i ; max = max_ ; } } for ( int i = 2 ; i <= N ; i ++ ) { if ( i != id ) { out . printf ( " ? ▁ % d ▁ % d \n " , id , i ) ; out . flush ( ) ; scan = new Scanner ( System . in ) ; max_ = scan . nextInt ( ) ; if ( max_ > max ) { max = max_ ; } } } out . printf ( " ! ▁ % d \n " , max ) ; out . flush ( ) ; }
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