Total CO2 Emissions Calculation

You are given a list of trips taken in a town. Each trip is described by a mode of transport and the distance traveled in kilometers. The mode is represented by a single character: B for bicycle and C for car. Only car trips produce CO2 emissions. In fact, each car trip produces $$2.3 \times d$$ kilograms of CO₂ for d kilometers. Your task is to compute the total CO₂ emissions for all the trips provided, rounding the final result to two decimal places.

Note: Bicycle trips do not contribute to the emissions.

inputFormat

The input is given via standard input (stdin) and has the following format:

• The first line contains an integer n — the number of trips.
• The following n lines each contain a trip description. Each description consists of a character (B or C) followed by an integer representing the number of kilometers traveled. The two values are separated by a space.

For example:

3
B 10
C 50
C 20

outputFormat

The output should be printed to standard output (stdout) and is a single line containing the total CO₂ emissions in kilograms, rounded to two decimal places.

For the sample input provided, the correct output is:

161.00

## sample

3
B 10
B 20
B 30

0.00