01. SoftUni Reception

first = int(input())
second = int(input())
third = int(input())
students = int(input())

counter = 1
hours = 0

while students > 0:
    students -= first + second + third
    hours += (2 if counter % 3 == 0 and students > 0 else 1)
    counter += 1

print(f"Time needed: {hours}h.")