—___________ It is not difficult at all.

输入x=1时，运行如图所示的程序，输出的x值为                     （    ）

阅读下文，回答相关问题。

                                                                                                               春  兴
                                                                                                       （唐）武元衡
                                                                                   杨柳阴阴细雨晴，残花落尽见流莺。
                                                                                   春风一夜吹乡梦，又逐春风到洛城。