#include <iostream>
using namespace std;
int main() {
int days, worksters, numberofcakes,numberofwaffles,numberpancakes;
cin >> days >> worksters >> numberofcakes >> numberofwaffles >> numberpancakes;
int cake = 45;
double waffle = 5.80;
double pancake = 3.20;
int pricecake = numberofcakes * cake;
int pricewaffle = numberofwaffles * waffle;
double pricepancake = numberpancakes * pancake;
int TotalPriceoneday = (pricecake + pricewaffle + pricepancake) / 8.0;
double Sumsafter = TotalPriceoneday * 23;
double Sumafterexpenses = Sumsafter - Sumsafter / 8;
cout.setf(ios::fixed);
cout.precision(2);
cout << Sumafterexpenses << endl;
}
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