Three brothers

from math import ceil

first_time = float(input())
second_time = float(input())
third_time = float(input())
father_time = float(input())

cleaning_time = 1 / (1 / first_time + 1 / second_time + 1 / third_time) * 1.15;

print(f"Cleaning time: {cleaning_time:.2f}")
if father_time - cleaning_time > 0:
    print(f"Yes, there is a surprise - time left -> {int(father_time - cleaning_time)} hours.")
else:
    print(f"No, there isn't a surprise - shortage of time -> {ceil(cleaning_time - father_time)} hours.")