04. Energy Loss

#include <iostream>
#include <iomanip>

using namespace std;

int main()
{
    int train_days;
    int num_dancers;
    cin >> train_days >> num_dancers;

    int energy_loss = 0;
    int total_energy = 100 * num_dancers * train_days;

    for (int i = 1; i <= train_days; ++i)
    {
        int train_hours;
        cin >> train_hours;

        int train = i % 2 == 0;
        int hours = train_hours % 2 == 0;
        int energy = 0;

        if (train && hours)
        {
            energy = 68;
        }
        else if (!train && hours)
        {
            energy = 49;
        }
        else if (train && !hours)
        {
            energy = 65;
        }
        else if (!train && !hours)
        {
            energy = 30;
        }

        double current_energy_used = energy * num_dancers;
        energy_loss += current_energy_used;
    }


    double left = total_energy - energy_loss;
    double energy_each_person = left / num_dancers / train_days;

    if (energy_each_person > 50)
    {
        cout << "They feel good! Energy left: "
            << fixed << setprecision(2) << energy_each_person
            << endl;
    }
    else
    {
        cout << "They are wasted! Energy left: "
            << fixed << setprecision(2) << energy_each_person
            << endl;
    }
    return 0;
}