Electricity Bill Calculation

In summer, the electricity consumption increases, hence the electricity bill increases as well. In this problem, you are given the total monthly electricity usage in kilowatt-hours (kWh). According to the pricing guidelines (as referenced in \(\text{闽价电 [2006]27\) ), the cost is computed based on the following tiers:

• For the first \(150\) kWh (i.e., when usage \(\le 150\)): \( cost = \text{usage} \times 0.4463 \) yuan.
• For the next portion between \(151\) and \(400\) kWh: \( cost = 150 \times 0.4463 + (\text{usage} - 150) \times 0.4663 \) yuan.
• For any usage above \(400\) kWh: \( cost = 150 \times 0.4463 + 250 \times 0.4663 + (\text{usage} - 400) \times 0.5663 \) yuan.

Your task is to compute the total bill based on the provided total monthly electricity usage.

inputFormat

The input consists of a single line containing a positive integer representing the total electricity usage in kWh.

outputFormat

Output the electricity bill calculated according to the above rules, formatted to two decimal places.

sample

100

44.63