public class E01ExperienceGaining {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        double expNeeded = Double.parseDouble(sc.nextLine());
        double expTotal= 0;
        int battles = Integer.parseInt(sc.nextLine());

        for (int i = 1; i <= battles; i++) {
            double exp = Double.parseDouble(sc.nextLine());

            if (i % 3 == 0) {
                exp *= 1.15;
            }

            if (i % 5 == 0) {
                exp *= 0.9;
            }

            expTotal += exp;

            if (expTotal >= expNeeded) {

                System.out.printf("Player successfully collected his needed experience for %d battles.", i);
                return;
            }
        }

        System.out.printf("Player was not able to collect the needed experience, %.2f more needed.", expNeeded - expTotal);
    }
}