Math problem: If a group of soldiers are arranged in a three-story hollow square, there will be seven more soldiers. If you add a third floor to the hollow part in the middle, you will lose 37 soldiers. How many soldiers are there? The number of people on the fourth floor is 37+7=44.

The number of people on the fourth floor is 8 less than that on the third floor, which is 52.

The number of people on the third floor is 8 less than that on the second floor, which is 60.

The number of people on the second floor is 8 less than that on the first floor, which is 68.

But the third floor is not enough, so the number of people is 180+7= 187.

Well, there are eight more. The side length plus 2 is hollow again ~