## \-\-- Day 2: I Was Told There Would Be No Math \-\--

The elves are running low on wrapping paper, and so they need to submit
an order for more. They have a list of the dimensions (length `l`, width
`w`, and height `h`) of each present, and only want to order exactly as
much as they need.

Fortunately, every present is a box (a perfect [right rectangular
prism](https://en.wikipedia.org/wiki/Cuboid#Rectangular_cuboid)), which
makes calculating the required wrapping paper for each gift a little
easier: find the surface area of the box, which is
`2*l*w + 2*w*h + 2*h*l`. The elves also need a little extra paper for
each present: the area of the smallest side.

For example:

-   A present with dimensions `2x3x4` requires `2*6 + 2*12 + 2*8 = 52`
    square feet of wrapping paper plus `6` square feet of slack, for a
    total of `58` square feet.
-   A present with dimensions `1x1x10` requires `2*1 + 2*10 + 2*10 = 42`
    square feet of wrapping paper plus `1` square foot of slack, for a
    total of `43` square feet.

All numbers in the elves\' list are in
feet.
How many total *square feet of wrapping paper* should they order?

## \-\-- Part Two \-\-- {#part2}

The elves are also running low on ribbon. Ribbon is all the same width,
so they only have to worry about the length they need to order, which
they would again like to be exact.

The ribbon required to wrap a present is the shortest distance around
its sides, or the smallest perimeter of any one face. Each present also
requires a bow made out of ribbon as well; the feet of ribbon required
for the perfect bow is equal to the cubic feet of volume of the present.
Don\'t ask how they tie the bow, though; they\'ll never tell.

For example:

-   A present with dimensions `2x3x4` requires `2+2+3+3 = 10` feet of
    ribbon to wrap the present plus `2*3*4 = 24` feet of ribbon for the
    bow, for a total of `34` feet.
-   A present with dimensions `1x1x10` requires `1+1+1+1 = 4` feet of
    ribbon to wrap the present plus `1*1*10 = 10` feet of ribbon for the
    bow, for a total of `14` feet.

How many total *feet of ribbon* should they order?

Both parts of this puzzle are complete! They provide two gold stars:
\*\*

At this point, you should [return to your Advent calendar](/2015) and
try another puzzle.

If you still want to see it, you can [get your puzzle
input](2/input).