IPhone 4S storage problem! Help!

My iPhone 4S had an alert that came up with I was trying to download a app (616 MB) from the app store. It said that "there is not enough available storage to download the app and that I need to manage my storage in settings." So then I started to delete a couple of my apps, and now in my usage area of my phone it says that I now have 647 MB available but when I go back to the app store to get the app that I wanted I still get the alert about my storage again! What do I do?

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