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 Ruby (2.3.3) (judge verdict: Runtime Error)

n =gets.to_i
s = gets.chomp.split('')
if s.size.odd?
  p 'No'
  exit
end
t = []
i=0
s.size/2.times do
  t << s[i]
  i += 1
end
t1 = []
n/2.times do
  t1 << s[i]
  i += 1
end
if t == t1
  puts 'Yes'
else
  puts 'No'
end