Number of Stickers

Given a Rubik's Cube with a side length of n, return the number of individual stickers that are needed to cover the whole cube.

• The Rubik's cube of side length 1 has 6 stickers.
• The Rubik's cube of side length 2 has 24 stickers.
• The Rubik's cube of side length 3 has 54 stickers.

Examples

how_many_stickers(1) ➞ 6

how_many_stickers(2) ➞ 24

how_many_stickers(3) ➞ 54

Notes

• Keep in mind there are six faces to keep track of.
• Expect only positive whole numbers.