## --- Day 2: Dive! ---

Now, you need to figure out how to pilot this thing.

It seems like the submarine can take a series of commands like `forward 1`

, `down 2`

, or `up 3`

:

`forward X`

increases the horizontal position by`X`

units.`down X`

*increases*the depth by`X`

units.`up X`

*decreases*the depth by`X`

units.

Note that since you're on a submarine, `down`

and `up`

affect your *depth*, and so they have the opposite result of what you might expect.

The submarine seems to already have a planned course (your puzzle input). You should probably figure out where it's going. For example:

```
forward 5
down 5
forward 8
up 3
down 8
forward 2
```

Your horizontal position and depth both start at `0`

. The steps above would then modify them as follows:

`forward 5`

adds`5`

to your horizontal position, a total of`5`

.`down 5`

adds`5`

to your depth, resulting in a value of`5`

.`forward 8`

adds`8`

to your horizontal position, a total of`13`

.`up 3`

decreases your depth by`3`

, resulting in a value of`2`

.`down 8`

adds`8`

to your depth, resulting in a value of`10`

.`forward 2`

adds`2`

to your horizontal position, a total of`15`

.

After following these instructions, you would have a horizontal position of `15`

and a depth of `10`

. (Multiplying these together produces

.)*150*

Calculate the horizontal position and depth you would have after following the planned course. *What do you get if you multiply your final horizontal position by your final depth?*