require "prime"

STDOUT.sync = true

N = gets.to_i
ans = 1
primes = Prime.each(N).to_a
primes.shuffle!
primes.each_slice(4).take(600).each do |ps|
    x = ps.map { |p|
        y = 1
        y *= p while y * p <= N
        y
    }.inject(1, :*)
    puts "? #{x}"
    ans *= gets.to_i
end

puts "! #{ans}"