N = 10010
isprime = [True] * N
isprime[0] = isprime[1] = False
for i in range(2, int(N ** 0.5 + 1)):
    if not isprime[i]:
        continue
    for j in range(i * i, N, i):
        isprime[j] = False

n = int(input())
primes = []
for i in range(2, n + 1):
    if isprime[i]:
        primes.append(i)

l = len(primes)
ans = 1
for i in range(0, l, 3):
    y = 1
    for j in range(i, i + 3):
        if j == l:
            break
        z = primes[j]
        while z * primes[j] <= n:
            z *= primes[j]
        y *= z
    print("?", y, flush=True)
    ans *= int(input())
print("!", ans)