Lisa is planning a garden, and she plants 4 rows of flowers, with 10 flowers in each row. She decides to give away 15 flowers to her neighbors, and unfortunately, 5 flowers were eaten by rabbits. At the end of the month, she buys and adds 20 more flowers to her garden. How many flowers does Lisa have in her garden at the end of the month? Let's think step by step and output the final answer within \boxed{}.
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