#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;





}