321 - Three Circles

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