# Tuenti Challenge 10

## Challenge 13 - The Great Toilet Paper Fortress

You work at a supermarket. And, due to some unexpected circumstances, people think that you're running out of toilet paper. Thankfully, however, your stock is pretty large. The manager has now asked you to build the biggest possible fortress using toilet paper packs. You won’t be opening the packs, you'll just build the fortress using the packs that customers will buy later. This way, buyers can be sure that there won't be a toilet paper shortage any time soon.

The fortress will have a central tower, which will be the tallest point of the fortress. And there must be at least one layer of walls surrounding the tower. You have the following instructions for building it:

• Step 1: Start with the central tower. It must be at least three packs tall. From the top, it will be seen as either a square or a rectangle. If it's a rectangle, the difference between the two dimensions can only be one pack.
• Step 2: Surround the previous packs, by making a new rectangular layer. This layer must have a height of two packs less than the previous one.
• Step 3: Surround again, this time with a rectangular layer that is one pack taller than the previous one (one pack shorter than the layer that the previous step surrounded).
• Step 4: If the last layer was two packs tall (which means that step 3’s layer was only one pack tall), you have finished. Otherwise, repeat steps 2 to 4.

Given a number of toilet paper packs, you must choose the highest possible fortress height. After that, you must choose the central tower dimensions that will make you use as many toilet paper packs as you can.

### Input

The first line contains the number of cases C. Then, C lines follow, each with the number of toilet paper packs P for that case.

### Output

For each case, output 'Case #X: H M', where X is the case number (the first case has number 1), H is the maximum height of the tower, and M is the maximum amount of packs you can use for building a fortress with that height. If it's not possible to build any fortress with the specified number of packs, write 'Case #X: IMPOSSIBLE' instead.

• 1 ≤ C ≤ 100
• 1 ≤ P ≤ 262

```3
20
76
160
```

### Sample Output

```Case #1: IMPOSSIBLE
Case #2: 3 76
Case #3: 4 156
```

In the first case, it's impossible to build a fortress of height 3.
In the second case, we build a fortress with a central tower of height 3 and 3x2 size.
In the third case, we build a fortress with a central tower of height 4 and 1x1 size.

Diagram of the second case:

 2 2 2 2 2 2 2 2 1 1 1 1 1 2 2 1 3 3 3 1 2 2 1 3 3 3 1 2 2 1 1 1 1 1 2 2 2 2 2 2 2 2

Diagram of the third case:

 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 2 2 1 3 3 3 3 3 1 2 2 1 3 2 2 2 3 1 2 2 1 3 2 4 2 3 1 2 2 1 3 2 2 2 3 1 2 2 1 3 3 3 3 3 1 2 2 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2

### Problem stats

Completion time: min: 0:26:07 h 10th percentile: 1:39:06 h 90th percentile: 22:35:24 h max: 42:34:38 h 10th percentile: 1:15:21 h 90th percentile: 20:40:41 h 10th percentile: 0:01:04 h 90th percentile: 4:17:17 h 107