def ask(i, j):
    print("?", i+1, j+1, flush=True)
    return int(input())-1

def tournament(now):
    while len(now) > 1:
        win = []
        for i, j in zip(now[::2], now[1::2]):
            win.append(ask(i, j))
            opp[i].append(j)
            opp[j].append(i)
        now = win
    return now[0]

n = int(input())
opp = [[] for _ in range(n)]

top = tournament(list(range(n)))
ans = tournament(opp[top])

print("!", ans+1, flush=True)