Hazel started her lemonade stand with some cups of lemonade. She sold half of the lemonade to a construction crew. Then, she sold 18 cups to kids on bikes and gave away half that amount to her friends. Finally, she drank the last cup of lemonade herself. How many cups of lemonade did Hazel start with? Let's think step by step and output the final answer within \boxed{}.
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