n = int(input())
a = 2 * 3 * 4 ** (n - 3)
b = (n - 3) * 9 * 4 ** (n - 4)
print(round(4 * (a + b)))
600C - Make Palindrome | 1669D - Colorful Stamp |
1669B - Triple | 1669A - Division |
1669H - Maximal AND | 1669E - 2-Letter Strings |
483A - Counterexample | 3C - Tic-tac-toe |
1669F - Eating Candies | 1323B - Count Subrectangles |
991C - Candies | 1463A - Dungeon |
1671D - Insert a Progression | 1671A - String Building |
1671B - Consecutive Points Segment | 1671C - Dolce Vita |
1669G - Fall Down | 4D - Mysterious Present |
1316B - String Modification | 1204A - BowWow and the Timetable |
508B - Anton and currency you all know | 1672A - Log Chopping |
300A - Array | 48D - Permutations |
677C - Vanya and Label | 1583B - Omkar and Heavenly Tree |
1703C - Cypher | 1511C - Yet Another Card Deck |
1698A - XOR Mixup | 1702E - Split Into Two Sets |