315 - Circle

Circle

Time Limit: 1 sec

**The Problem**

Suppose there is a **Circle**. The **Radius** will be given.

Your task is to tell the **Area** of that **Circle**.

Note : The Area of Circle is **pi * (Radius) ^{2}**

Here **pi** = 3.1416

**The Input**

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

**The Output**

For each line of input print the Area of the **Circle** rounded to 2 decimal points in a separate line.

**Sample Input**

10

8

5

**Sample Output**

314.16

201.06

78.54

Problem Setter: Samia Safa Ahmed