Advice on Henri Cohen's Number Theory books

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I am a graduate student willing to learn Number Theory. I have come across Henri Cohen's "Number Theory" (Vol. I and II) and I would like to hear from someone who has read these books before: are they comprehensive and clear? Is there any particular topic which is not so well covered? I apologize if the question seems vague but any comments regarding these books would be appreciated, since I have not been able to find anything elsewhere.