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>
	#define endl "\n"
	#define ll long long int
	#define vi vector<ll>
	#define vll vector<ll>
	#define vvi vector < vi >
	#define pii pair<ll,ll>
	#define pll pair<long long, long long>
	#define mod 1000000007
	#define inf 1000000000000000001;
	#define all(c) c.begin(),c.end()
	#define mp(x,y) make_pair(x,y) 
	#define mem(a,val) memset(a,val,sizeof(a))
	#define pb push_back
	#define f first
	#define s second
	
	using namespace std;
	
	signed main()
	{

	std::ios::sync_with_stdio(false);
	
	

	int r;
	cin>>r;
    ll p = r*r;
	cout<<p;
	return 0;
	}