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 <vector>
#include <list>
#include <set>
#include <map>
#include <stack>
#include <queue>
#include <string>
#include <algorithm>
#include <iostream>
#define rep(i, n) for(int64_t i=0;i<(n);++i)
#define for(i, a, b) for(int64_t i=(a);i<(b);++i)
#define all(obj) (obj).begin(), (obj).end()
#define in(x) cin >> (x)
#define out(y) cout << (y) << "\n"
#define i64 int64_t
#define str string
using namespace std;
void Main() {
	/*----------------------------------------------------------------------------------------------------*/
	i64 r; in(r);
	out(r * r);
	/*----------------------------------------------------------------------------------------------------*/
}
int main() {
	cin.tie(nullptr);
	ios_base::sync_with_stdio(false);
	Main();
	return 0;
}