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 Java8 (OpenJDK 1.8.0) (judge verdict: Runtime Error)

package abc094.d;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main
{

  public static void main(String[] args) throws IOException
  {
    BufferedReader r = new BufferedReader(new InputStreamReader(System.in), 1);
    String sl[];

    sl = r.readLine().split(" ");
    int n = Integer.parseInt(sl[0]);
    System.out.println(n * n);



  }

}


class RemRing
{
 long module;
 public RemRing(long module)
 {
   this.module = module;
 }

 public long sum(long a, long b)
 {
   return (a + b + module) % module;
 }

 public long sub(long a, long b)
 {
   return (a - b + module) % module;
 }

 public long prod(long a, long b)
 {
   return (a * b) % module;
 }

 public long div(long a, long b)
 {
   return (a * inv(b)) % module;
 }

 public long inv(long a)
 {
   long b = this.module;
   long u = 1;
   long v = 0;
   while(b > 0)
   {
     long t = a / b;
     a -= t * b;
     u -= t * v;
     long z = a;
     a = b;
     b = z;
     z = u;
     u = v;
     v = z;
   }
   u %= this.module;
   if(u < 0) u += this.module;
   return u;
 }
}