n = int(input())
print(n * n)
#include <iostream>
using namespace std;
int main() {
int n;
cin >> n;
cout << n * n << "\n";
return 0;
}
const fs = require('fs');
const input = fs.readFileSync(0, 'utf8').trim();
const n = parseInt(input, 10);
console.log(n * n);