Excursion

#include <iostream>
#include <string>

using namespace std;

int main() {
    int people, nights, cards, tickets;
    cin >> people >> nights >> cards >> tickets;

    double total = (20.00 * nights + 1.60 * cards + 6.00 * tickets) * people * 1.25;

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

    return 0;
}