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 OCaml (4.02.3) (judge verdict: Wrong Answer)

Printf.printf "%d\n" @@ match read_line () with "SUN" -> 7 | "MON" -> 6 | "TUE" -> 5 | "WED" -> 4 | "THU" -> 3 | "FRI" -> 2 | _ -> 1