Homework must be done in Python. Only the extra extra tasks, like Nedvoumna števila, which do not count for anything, can be solved in arbitrary languages.

The mandatory part is mandatory, the second part is important only for higher grades. See the rules.

The task will probably be rather simple for majority of students. It won't always be like this. :)

## Mandatory part

Ships need fuel. The required amount depends upon the weight of the cargo. "Instructions for use" state that it goes like this: divide the cargo weight by 3, round down to an integer and subtract two. Repeat. Repeat. Repeat ... The amount of fuel equals the number of steps needed to reach 0 or a negative number.

For example, let the cargo weight 756 tons.

1. 756 / 3 - 2 = 250
2. 250 / 3 - 2 = 81
3. 81 / 3 - 2 = 25
4. 25 / 3 - 2 = 6
5. 6 / 3 - 2 = 0

We need five steps to reach 0, so we need 5 tons of fuel.

Write a program into which we enter the weight of the cargo, and it computes the required quantity of fuel. If we enter 756, it prints 5. If we enter 100756, it prints 10.