06. Fishland

#include <iostream>

using namespace std;

int main() {
    double mackerelPrice, spratPrice, bonitoFishKg, saffronKg, shellKg;
    cin >> mackerelPrice >> spratPrice >> bonitoFishKg >> saffronKg >> shellKg;

    double bonitoFishSum = bonitoFishKg * mackerelPrice * 1.60;
    double saffronSum = saffronKg * spratPrice * 1.80;
    double shellSum = shellKg * 7.50;
    double totalPrice = bonitoFishSum + saffronSum + shellSum;

    cout.setf(ios::fixed);
    cout.precision(2);

    cout << totalPrice << endl;

    return 0;
}