$>.sync = true

N = gets.to_i
$res = Hash.new []

def f(a)
  while a.size > 1
    new_a = []
    a.each_slice(2){|x, y|
      if y.nil?
        new_a << x
        next
      end
      puts"? #{x} #{y}"
      z = gets.to_i
      new_a << z
      if z == x
        $res[x] += [y]
      else
        $res[y] += [x]
      end
    }
    a = new_a
  end
  a[0]
end

first = f([*1..N])
second = f($res[first])
puts "! #{second}"