def calculate_discounted_price(original_price): if original_price >= 4000: discounted_price = original_price * 0.6 elif original_price >= 3000: discounted_price = original_price * 0.7 elif original_price >= 2000: discounted_price = original_price * 0.8 else: discounted_price = original_price return discounted_price def main(): # 输入原价（折扣前的金额） original_price = int(input()) # 计算实际交付的钱数（折扣后的价格） discounted_price = calculate_discounted_price(original_price) # 输出实际交付的钱数，保留到小数点后1位 print(f"{discounted_price:.1f}") if __name__ == "__main__": main()