import sys
input=sys.stdin.readline
def ask(a,b):
    print(f"? {a} {b}",flush=True)
    return int(input())
N=int(input())
p=[ask(i,N-1) for i in range(N-1)]
S=[i for i in range(N-1) if p[i]>0]
d=[0]*N
if len(S)>=2:
    i,j=S[:2]
    q=ask(i,j)
    d[N-1]=round((p[i]*p[j]//q)**.5)
    for k in range(N-1):d[k]=p[k]//d[N-1]
    print(f"! {sum(d[k]*10**k for k in range(N))}",flush=True)
elif len(S)==1 and p[S[0]] in {1,25,49,64,81}:
    k=S[0];v=round(p[k]**.5)
    print(f"! {v*10**(N-1)+v*10**k}",flush=True)
else:
    print("! -1",flush=True)