mod = 998244353


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

    N = int(input())
    if N != 1:
        exit()
    for _ in range(600):
        print("?", 1)
        sys.stdout.flush()
        s = int(input())
    print("?", 1)
    sys.stdout.flush()
    s = int(input())
    assert s == -1
    print("!", 1)
    sys.stdout.flush()


if __name__ == '__main__':
    main()