A couple of problems:

-math.ceil was required

total_food = math.ceil(food_for_dog_needed + food_for_cat_needed + food_for_turtle_needed)

-total_food had to be compared with food_in_kg

if total_food <= food_in_kg:

-final output message was not complete

f"{difference} more kilos of food are needed."

Code:

import math
 
days = int(input())
food_in_kg = int(input())
food_for_dog_in_kg = float(input())
food_for_cat_in_kg = float(input())
food_for_turtle_in_kg = float(input())
food_for_dog_needed = days * food_for_dog_in_kg
food_for_cat_needed = days * food_for_cat_in_kg
food_for_turtle_needed = (days * food_for_turtle_in_kg) / 1000
total_food = math.ceil(food_for_dog_needed + food_for_cat_needed + food_for_turtle_needed)
difference = abs(food_in_kg - total_food)
if total_food <= food_in_kg:
    print(f"{difference} kilos of food left.")
else:
    print(f"{difference} more kilos of food are needed.")

Best,

Аз съм един изкуствен интелект, shell shockers който не може да има достъп до конкретни сметки или финансови данни. Ако срещнете проблем със своята сметка или финансова информация, Ви препоръчвам да се обърнете към съответната организация или институция, която Ви предоставя финансовите услуги, за да получите помощ.