Pool Day

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

using namespace std;

int main() {
    int people;
    cin >> people;

    double entrancePrice, deskChairPrice, umbrellaPrice;
    cin >> entrancePrice >> deskChairPrice >> umbrellaPrice;

    double total = entrancePrice * people + deskChairPrice * ceil(0.75 * people) + umbrellaPrice * ceil(0.5 * people);

    printf("%.2f lv.\n", total);

    return 0;
}