`@`$\color{ Turquoise }{\texttt{C++}}$

#include <bits/stdc++.h>
#define int long long
using namespace std;
signed main()
{
  int n; cin >> n;
  cout << n * n;
}

`@`$\color{ Turquoise }{\texttt{Python}}$

n = int(input())
print(n * n)

$\color{Turquoise}{\triangleright \triangleright\ \color{ Turquoise}{\texttt{ItzPhuc} \triangleleft \triangleleft}}$

`color(#FFFFFFff)(H)color(#E7E7E7ff)(o)color(#CFCFCFff)(r)color(#B7B7B7ff)(i)color(#9F9F9Fff)(z)color(#878787ff)(o)color(#6F6F6Fff)(n)`

#include <iostream>
using namespace std;

int main() {
    int n; cin >> n;
    int cuoi = 2*n + 1;
    cout << ( (cuoi + 1) * (cuoi + 1) ) / 4;
}