Sarah is planning a birthday party and needs to budget for the expenses. She has a total budget of $500. She plans to spend $150 on venue rental, $80 on food, and $50 on decorations. She also wants to buy gifts for the guests, each gift costing $15. How many gifts can she buy without exceeding her budget, and how much money will she have left after purchasing the gifts? Let's think step by step and output the final answer within \boxed{}.
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