Problem:
Score : 100 points

Problem Statement

Given is an integer r.

How many times is the area of a circle of radius r larger than the area of a circle of radius 1?

It can be proved that the answer is always an integer under the constraints given.

Constraints

1 \leq r \leq 100

All values in input are integers.

Input

Input is given from Standard Input in the following format:

r

Output

Print the area of a circle of radius r, divided by the area of a circle of radius 1, as an integer.

Sample Input 1

2

Sample Output 1

4

The area of a circle of radius 2 is 4 times larger than the area of a circle of radius 1.

Note that output must be an integer - for example, 4.0 will not be accepted.

Sample Input 2

100

Sample Output 2

10000

Solution in PHP7 (7.0.15) (judge verdict: Accepted)

<?php
class Circle {
    var $r;
    
    function __construct() {
        fscanf(STDIN, "%d", $this->r);
    }
    
    function __invoke() {
        return pow($this->r, 2);
    }
}

$obj = new Circle();
echo $obj();