In a particular garden, there are 5 different types of flowers. The number of roses is 10 more than the number of tulips. The number of tulips is half the number of daisies. The number of daisies is 5 less than the number of sunflowers. The number of sunflowers is twice the number of lilies. If there are 15 lilies, how many flowers are there in total? Let's think step by step and output the final answer within \boxed{}.
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