package com.company;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int firstEmployeeEfficiency = Integer.parseInt(scanner.nextLine());
        int secondEmployeeEfficiency = Integer.parseInt(scanner.nextLine());
        int thirdEmployeeEfficiency = Integer.parseInt(scanner.nextLine());
        int studentsCount = Integer.parseInt(scanner.nextLine());
        int studentsCounter = 0;
        int hoursCounter = 0;
        int hours = 0;
        while (studentsCount > studentsCounter) {
            studentsCounter = studentsCounter + firstEmployeeEfficiency + secondEmployeeEfficiency
                    + thirdEmployeeEfficiency;
            hoursCounter++;
            hours ++;
            if (hoursCounter % 4 == 0) {
                hours++;
            }
        }
        System.out.printf("Time needed: %dh.", hours);
    }
}