#include <iostream>
#include <vector>
#include <cmath>
#include <map>
#include <set>
#include <iomanip>
#include <queue>
#include <algorithm>
#include <numeric>
#include <deque>
#include <complex>
#include <cassert>

using namespace std;
using ll = long long;

int main(){

    int t;
    long double x;
    cin >> t;

    for (int i=0; i<t; i++){
        cin >> x;
        cout << setprecision(18) << x*x*1.299038105676657 << endl;
    }

    return 0;
}