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 <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef pair<int, int> ii;
typedef vector<ii> vii;
typedef vector<int> vi;

// Common memset settings
//memset(memo, -1, sizeof memo); // dp memoization with -1
//memset(arr, 0, sizeof arr); //clear array of integers




int main(){
	//ios::sync_with_stdio(0);
	//cin.tie(0);
	
	//freopen("input.txt", "r", stdin);
	//freopen("output.txt", "w", stdout);


	int r;

	cin >> r;

	cout << r*r;

	return 0;
}