import java.util.Scanner;

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

        int employeesOne = Integer.parseInt(scanner.nextLine());
        int employeesTwo = Integer.parseInt(scanner.nextLine());
        int employeesThree = Integer.parseInt(scanner.nextLine());

        int allStudents = 0;

        int studentsHour = 0;

        double neededTime = employeesOne + employeesTwo + employeesThree;

        while (allStudents > 0) {

            if (allStudents % 4 == 0) {
                allStudents -= studentsHour;
                continue;

            }
        }
        System.out.printf("Time needed: %f.", neededTime);
    }
}