01. Softuni reception mid exam 05 07 2020

empl_1 = int(input())
empl_2 = int(input())
empl_3 = int(input())
all_student = int(input())
students_to_answer = all_student
student_per_hour = empl_1+empl_2+empl_3
time_for_answers = 0

while students_to_answer > 0:
    for i in range(1, 4):
        students_to_answer -= student_per_hour
        time_for_answers += 1
        if students_to_answer <= 0:
            break
        else:
            i += 1
    if students_to_answer > 0:
        time_for_answers += 1
        i = 1

print(f'Time needed: {time_for_answers}h.')