Description

The luggage托运 (checked baggage) fee standard at a certain station is as follows: for 10 kilograms or less, the fee is 2.5 yuan. For luggage exceeding 10 kilograms, an additional 1.5 yuan is charged for each extra kilogram.

Write a program that takes the weight of the luggage as input and calculates the托运 fee (rounded to one decimal place).

Input Format

One line: A floating-point number representing the weight of the luggage.

Output Format

One line: A floating-point number representing the托运 fee (rounded to one decimal place).

10

2.5

译文

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