import sys

def ask(a, b):
    print("?", a, b, flush=True)
    x = int(sys.stdin.readline())
    if x == -1:
        sys.exit()
    return x

def done(s):
    print("!", s, flush=True)
    sys.exit()

n = int(sys.stdin.readline())

vals = [0] * (n - 1)
nz = []

for i in range(n - 1):
    vals[i] = ask(i, n - 1)
    if vals[i] > 0:
        nz.append(i)

ans = [0] * n

if not nz:
    done(-1)

if len(nz) == 1:
    i = nz[0]
    p = vals[i]

    ways = []
    for a in range(1, 10):
        if p % a == 0:
            b = p // a
            if 1 <= b <= 9:
                ways.append((a, b))

    if len(ways) != 1:
        done(-1)

    lead, other = ways[0]
    ans[n - 1] = lead
    ans[i] = other

else:
    i = nz[0]
    j = nz[1]
    mid = ask(i, j)

    sq = vals[i] * vals[j] // mid
    lead = int(sq ** 0.5)
    while (lead + 1) * (lead + 1) <= sq:
        lead += 1
    while lead * lead > sq:
        lead -= 1

    ans[n - 1] = lead
    for k in range(n - 1):
        ans[k] = vals[k] // lead

done("".join(str(ans[i]) for i in range(n - 1, -1, -1)))