Flies are Betty's frog's favorite food. Every day the frog eats 2 flies. Betty puts the flies she finds in a bottle. In the morning Betty catches 5 flies inside a bottle, and in the afternoon she catches 6 more, but when she removes the lid, one escapes.  Betty wants to gather the whole week's food for her frog. How many more flies does she need?
Please reason step by step, and put your final answer within \boxed{}.
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