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

def tournament(now):
    lose = [[] for _ in range(n)]
    while len(now) > 1:
        win = []
        for i, j in zip(now[::2], now[1::2]):
            w = ask(i, j)
            lose[w].append(i ^ j ^ w)
            win.append(w)
        if len(now) & 1: win.append(now[-1])
        now = win
    return now[0], lose

n = int(input())

top, lose = tournament(list(range(n)))
ans, _ = tournament(lose[top])

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