01. SoftUni Reception

first_workers = int(input())
second_workers = int(input())
third_workers = int(input())
students = int(input())
students_per_hour = first_workers + second_workers + third_workers
hours = 0
while students > 0:
    hours += 1
    if hours % 4 == 0:
        continue
    students -= students_per_hour
print(f'Time needed: {hours}h.')