output_description: Print the area of a circle of radius r, divided by the area of a circle of
  radius 1, as an integer.
  
  * * *
input_description: Input is given from Standard Input in the following format:
  
      
      
      r
attempt: from sys import stdin
  
  
  # from collections import deque
  # from math import sqrt, floor, ceil, log, log2, log10, pi, gcd
  def ii():
      return int(stdin.readline())
  
  
  def fi():
      return float(stdin.readline())
  
  
  def mi():
      return map(int, stdin.readline().split())
  
  
  def fmi():
      return map(float, stdin.readline().split())
  
  
  def li():
      return [x for x in mi()]
  
  
  def si():
      return stdin.readline()
  
  
  n = ii()
  print(n * n)
  
problem_description: 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.
samples: [{"input": "2", "output": "4\n    \n\nThe area of a circle of radius 2 is 4 times larger than the area of a circle\nof radius 1.\n\nNote that output must be an integer - for example, `4.0` will not be accepted.\n\n* * *"}, {"input": "100", "output": "10000"}]