def f(n):
    kekka = [[] for _ in range(n + 1)]
    member = [x for x in range(1, n + 1)]
    while len(member) > 1:
        nm = []
        for a, b in zip(member[::2], member[1::2]):
            print("?", a, b)
            w = int(input())
            if w == b: a, b = b, a
            nm.append(a)
            kekka[a] += [b]
        if len(member) % 2:
            nm.append(member[-1])
        member = nm

    winner = member[0]
    member = kekka[winner]

    while len(member) > 1:
        nm = []
        for a, b in zip(member[::2], member[1::2]):
            print("?", a, b)
            w = int(input())
            if w == b: a, b = b, a
            nm.append(a)
        if len(member) % 2:
            nm.append(member[-1])
        member = nm

    print("!", member[0])

n=int(input())
f(n)