#include <iostream>
using namespace std;
int main()
{
    int n;
    cin >> n;
    int arr[n*2];
    for ( int i = 0 ; i < n*2 ; i ++ )
    {
        cin >> arr[i];
    }

    int houses;
    cin >> houses;
    int meter = houses*houses;
    cout << meter;


    return 0;
}