is_prime = [1] * 10001
lcm10000 = 1
for p in range(2,10001) :
	if is_prime[p] == 1 :
		for j in range(p*p, 10001, p) :
			is_prime[j] = 0
		pp = p
		while pp * p <= 10000 :
			pp *= p
		lcm10000 *= pp
print("?", lcm10000)
ans = int(input())
print(ans)