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 <iostream>
using namespace std;
#include <vector>
#include <utility>
#include <math.h>
#include <climits>
#include <string.h>
#include <algorithm>
#include <set>
#include <bitset>
#include <map>
#include <unordered_map>
#include <queue>
#include <stack>
#include <iomanip>

#define loopi(i,n) for(int i=0;i<n;i++)
#define loopi1(i,n) for(int i=1;i<=n;i++)
#define vin vector<int>v(n,0)
#define pi pair<int,int>
#define f first
#define s second
#define lli long long int
#define ll long long
#define li long int
#define MODPRM  1000000009
#define MOD 1000000007



int main() {
	// your code goes here
	ios::sync_with_stdio(false);
	cin.tie(NULL);
/*	#ifndef ONLINE_JUDGE
	freopen("input.txt", "r", stdin);

    // Printing the Output to output.txt file
    freopen("output.txt", "w", stdout);

	#endif // ONLINE_JUDGE*/
    int r;
    cin>>r;
    cout<<r*r<<endl;

    return 0;
}