How many access points do I need?

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http://serverfault.com – My company has 6 floors and each floor is roughly around 5000 sq ft. I was wondering to cover the whole building with wireless connections. So how many access point do I need to setup to cover the whole building ? How many switches and what kind of hardware, software, and transmission media do I need ? And what kind of other IT infrustrure do I might need for its network? Thanks (HowTos)