Three Circles

Time Limit: 1 sec

 

The Problem

Suppose you have three Circles. First Radius will be given. Second Radius is half of first one and third one is half of second one.

Your task is to tell the total Area if we add all the three Areas.

 

 

The Input

Input file contains a series of line. Each line contains a single integer number, the Radius of first Circle, R (R<100). Input is terminated by EOF

 

The Output

For each line of input print the total Area of three Circles rounded to 2 decimal points in a separate line.

 

Sample Input

10

15

8

 

Sample Output

412.33

927.75

263.89

 

 

 

Problem Setter: Samia Safa Ahmed