mod = 1000000007
eps = 10**-9


def main():
    import sys
    input = sys.stdin.readline

    def ask(k):
        print("?", k)
        sys.stdout.flush()
        return int(input())

    N = int(input())

    s0 = ask(1)
    s1 = ask(N - 1)
    if s0 == s1:
        print("!", 2, N - 1)
        sys.stdout.flush()
        exit()
    s0 = s0 - (1 - s0)
    s1 = s1 - (N - 1 - s1)
    ll = s0
    rr = s1

    l = 1
    r = N - 1
    for _ in range(18):
        mid = (l + r) // 2
        s = ask(mid)
        s = s - (mid - s)
        if s == 0:
            if mid < N // 2:
                print("!", mid + 1, N)
            else:
                print("!", 1, mid)
            sys.stdout.flush()
            exit()
        if s // abs(s) == ll:
            l = mid
        else:
            r = mid


if __name__ == '__main__':
    main()