Is it improper or even unethical to apply for several openings in the same company? (Please read details)?

I just graduated from college and am looking for a job. I am seriously considering applying for a top publishing house that currently has openings for an editorial istant for SEVERAL of its publications. Three of the publications interest me and I'd like to try for each of their ed. ***. openings but I'm not entirely sure if I can do that. Would it be unethical for me to do so?