100 atcoder#ABC145A. [ABC145A] Circle

[ABC145A] Circle

Score : 100100 points

Problem Statement

Given is an integer rr.

How many times is the area of a circle of radius rr larger than the area of a circle of radius 11?

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

Constraints

  • 1r1001 \leq r \leq 100
  • All values in input are integers.

Input

Input is given from Standard Input in the following format:

rr

Output

Print the area of a circle of radius rr, divided by the area of a circle of radius 11, as an integer.

2
4

The area of a circle of radius 22 is 44 times larger than the area of a circle of radius 11.

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

100
10000