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;

#define INF 1001001001  //int32_t
#define MOD 1000000007
#define MOD2 

#define all(a)  (a).begin(),(a).end()

#define mkp make_pair
#define pb push_back

typedef long long ll;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;

int main(){

    bool flag=false;
    ll ans=0,sum=0;

    int n,m;
    cin >>n;

    //cout <<fixed<<setprecision(16)<< << endl;
    cout << n*n << endl;

    //if(flag)cout << "Yes" <<endl;
    //else cout << "No" <<endl;
    
    return 0;
}