import java.util.Scanner;

public class IntroPagawanEquipment {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        double money = Double.parseDouble(scanner.nextLine());

        int countStudents = Integer.parseInt(scanner.nextLine());

        double lightSabresPrice = Double.parseDouble(scanner.nextLine());
        double robesPrice = Double.parseDouble(scanner.nextLine());
        double beltsPrice = Double.parseDouble(scanner.nextLine());

        double allRopes = robesPrice * countStudents;
        double allBelts =0;

        double allLightSabre = lightSabresPrice * (countStudents + Math.ceil(countStudents * 0.1));


        if (countStudents >=6){
            allBelts = beltsPrice * ((countStudents - countStudents/6d));
        }else {
           allBelts = beltsPrice * countStudents;
        }

        double price = allLightSabre + allRopes + allBelts;

        if (money >= price){
            System.out.printf("The money is enough - it would cost %.2flv.",price);
        }else {
            System.out.printf("Ivan Cho will need %.2flv more.", Math.abs(price - money));
        }






    }
}