Why does he use 5, didn´t get the idea I mean, if we divide 16 / 6 slices = 2.6 but, if we know that the pizza shop produce only pizzas with 6 slices 6 * 3 = 18 If we take in count what he proposed he is summing 5 slices more with the 5 inicially, why this movement?

Hey Arnaldo, Thank you for the question! The pizza shop only offers pizzas that have 6 slices. Therefore, the possible number of slices that one could get is 6, 12, 18, 24, 30, ... Imagine that we do not know a priori what the value of total_slices is. Whichever the value, we want to make sure that everybody gets a piece. Let's change the task a little and say that we have only two friends - Bob and Ann. Bob will eat 4 slices, Ann will eat 3 slices and so total_slices = 7. We want to figure out the number of pizzas we need. 7//6 = 1, that won't be enough. 8//6 = 1 -> that won't be enough either. The number that will ensure we obtain 2 is 5 -> (7+5)//6 = 2. The nice thing about adding 5 is that, regardless of the value of total_slices, it will always help you get the correct amounts of pizzas. In the example above, one can argue that all numbers from 5 through 10 would have done the job. That is true unless we change the number of total slices from 7 to 11. We would still need two pizzas. However, (11+10)//6 = 3, whereas (11+5)//6 = 2. Hope this helps! Kind regards, 365 Hristina