Method 1: First mark the numbers layer by layer (i.e. which layer), and then underline the odd and even numbers.

Method 2: first find a layer that doesn't need mending, count how many bricks there are, and then have a look. Every floor is missing a few bricks, so add one. (o(∩_∩)o ... haha, while the number of bricks in each row is the same. )