第1关：存款买房 - A

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import math

total_cost = float(input())           # '请输入总房价：'total_cost为当前房价
annual_salary = float(input())        # '请输入年薪：'
portion_saved = float(input()) / 100  # '请输入月存款比例：'月存款比例，输入30转为30%

# 根据首付款比例计算首付款金额和每个月需要存款数额
down_payment = total_cost * 0.3
monthly_deposit = (annual_salary / 12) * portion_saved

print(f'首付 {down_payment:.2f} 元')
print(f'月存款 {monthly_deposit:.2f} 元')

# 计算多少个月才能存够首付款，结果为整数，不足1月按1个月计算，即向上取整
number_of_months = math.ceil(down_payment / monthly_deposit)

print(f'需要{number_of_months}个月可以存够首付')

第2关：存款买房 - B

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total_cost = float(input())  # total_cost为当前房价
annual_salary = float(input())  # 年薪
portion_saved = float(input()) / 100  # 月存款比例，输入30转为30%
semi_annual_raise = float(input()) / 100  # 输入每半年加薪比例，输入7转化为7%

portion_down_payment = 0.3  # 首付比例，浮点数
down_payment = total_cost * portion_down_payment  # 计算首付款

print(f"首付 {down_payment:.2f} 元")

current_savings = 0  # 存款金额，从0开始
number_of_months = 0
monthly_salary = annual_salary / 12  # 月工资
monthly_deposit = monthly_salary * portion_saved  # 月存款

while current_savings < down_payment:
    current_savings += monthly_deposit
    number_of_months += 1
    if number_of_months % 6 == 0:
        monthly_salary *= 1 + semi_annual_raise
        monthly_deposit = monthly_salary * portion_saved

    if number_of_months % 12 == 0:
        print("第{}个月月末有{:,.0f}元存款".format(number_of_months, current_savings))

print(f"需要{number_of_months}个月可以存够首付")

第3关：存款买房 - C

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total_cost = float(input())  # total_cost为当前房价
annual_salary = float(input())  # 年薪
portion_saved = float(input()) / 100  # 月存款比例，输入30转为30%
semi_annual_raise = float(input()) / 100  # 输入每半年加薪比例，输入7转化为7%

portion_down_payment = 0.3  # 首付比例，浮点数
down_payment = portion_down_payment * total_cost  # 首付款
print(f"首付 {down_payment:.2f} 元")

current_savings = 0  # 存款金额，从0开始
number_of_months = 0

while current_savings < down_payment:
    current_savings += current_savings * 0.0225 / 12  # 计算每月存款利息
    current_savings += annual_salary / 12 * portion_saved  # 计算每月存款
    number_of_months += 1
    if number_of_months % 6 == 0:
        annual_salary += annual_salary * semi_annual_raise

    if number_of_months % 12 == 0:
        print("第{}个月月末有{:,.0f}元存款".format(number_of_months, current_savings))

print(f"需要{number_of_months}个月可以存够首付")