#HELP

P=[]
N=int(input())
F=[0]*(N+1)
for i in range(2,N+1):
  if F[i]:
    continue
  P.append(i)
  for j in range(i,N+1,i):
    F[j]=1
from random import *
Q=[]
for i in range(len(P)):
  Q.insert(randrange(0,len(Q)+1),P[i])
P=Q[:]
M=5
i=0
A=[]
C=0
while i<len(P) and C<=595:
  v=1
  while i<len(P) and v*P[i]<=N:
    v*=P[i]
    i+=1
  print('?',v)
  C+=1
  S=int(input())
  for j in range(len(P)):
    if S%P[j]==0:
      A.append(P[j])
Z=1
for i in range(len(A)):
  v=1
  while v*A[i]<=N:
    v*=A[i]
  print('?',v)
  Z*=int(input())
print('!',Z)