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)

#include <string>
#include <cstdlib>
#include <algorithm>
#include <vector>
#include <string.h>
#include <utility>
#include <queue>
#include <stack>
#include <iomanip>
#include <ctype.h>
#include <map>
#include <set>
#include <stdio.h>
#include <assert.h>
#include <ctype.h>
#include <sstream>
#include <math.h>
#include <time.h>
#include <iostream>
#include <iomanip>
#include <unordered_set>
#include <unordered_map>
#include <stdlib.h>
#include <stdio.h>
#include <ctype.h>
#include <tuple>
#include <cmath>
#include <stdio.h>      /* printf, fgets */
#include <stdlib.h>
#include <fstream>

using namespace std;

typedef long long LL;

#define FOR(i,n) for(int i = 0;i < n;i++)
#define MP make_pair
#define PB push_back
#define ALL(a) (a).begin(),(a).end()
#define PII pair<int, int>
#define PLL pair<long long, long long>
#define CLEAR(a) memset(a, 0, sizeof(a))
#define INF 2000000007LL
#define y1 uu1
#define y2 uu2
const double EPS = 1E-12;
const double PI = acos(-1.0);
const LL mod = 1000000007;

using namespace std;

int r;

int main(int argc, char* argv[]) {
  ios_base::sync_with_stdio(0);
  cin >> r;
  cout << r * r << endl;

  return 0;
}