#include <iostream>
#include <string>
#include <iomanip>
#include <cmath>

struct Atom
{
    std::string name;
    double mass;
    double APF;
    double r;
};

Atom elemList[] =
{
    { "Po",   208.998, 0.52360, 1.68 },
    { "Li",     6.941, 0.68017, 1.52 },
    { "Na", 22.989770, 0.68017, 1.86 },
    { "Cr",   51.9961, 0.68017, 1.28 },
    { "Mn", 54.938049, 0.68017, 1.27 },
    { "Fe",    55.845, 0.68017, 1.26 },
    { "Mo",     95.94, 0.68017, 1.39 },
    { "Ta",  180.9749, 0.68017, 1.46 },
    { "Al", 26.981538, 0.74048, 1.43 },
    { "Ca",    40.078, 0.74048, 1.97 },
    { "Ni",   58.6934, 0.74048, 1.24 },
    { "Cu",    63.546, 0.74048, 1.28 },
    { "Ge",     72.64, 0.74048, 1.22 },
    { "Ag",  107.8682, 0.74048, 1.44 },
    { "Pt",   195.078, 0.74048, 1.39 },
    { "Au", 196.96655, 0.74048, 1.44 },
    { "Pb",     207.2, 0.74048, 1.75 }
};

template <int N> double pow(double a) { return a * pow<N - 1>(a); }

template <> double pow<0>(double a) { return 1; }

int main()
{

    int n;
    std::cin >> n;
    for (int i = 0; i < n; ++i)
    {
        std::string in;
        std::cin >> in;
        for(const auto& e : elemList)
        {
            if(e.name == in)
            {
                double V = 4.0 * M_PI * pow<3>(e.r) / 3.0;
                std::cout << std::fixed << std::setprecision(2) << 10.0 * e.mass * e.APF / 6.022 / V << std::endl;
                break;
            }
        }
    }
    return 0;
}