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 C++14 (GCC 5.4.1) (judge verdict: Accepted)

/**
 *  @author: pr4shan7 (प्रशांत)
 */
// #define _DEBUG

#ifndef _DEBUG
#define NDEBUG
#endif

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>

using namespace std;
using namespace __gnu_pbds;

typedef tree<int, null_type, less<int>, rb_tree_tag, tree_order_statistics_node_update> pb_set;

int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);

#ifdef _DEBUG
  ifstream cin("input.txt");
  // ofstream cout("output.txt");
#endif

  long long r;
  cin >> r;
  cout << pow(r, 2) << '\n';
  return 0;
}