# 入力
import sys
stdin = sys.stdin

def li(): return [int(x) for x in stdin.readline().split()]
def li_(): return [int(x)-1 for x in stdin.readline().split()]
def lf(): return [float(x) for x in stdin.readline().split()]
def ls(): return stdin.readline().split()
def ns(): return stdin.readline().rstrip()
def lc(): return list(ns())
def ni(): return int(ns())
def nf(): return float(ns())

p = ni()

# 3がつく数の個数を調べる
dp = [[0,0] for _ in range(p+1)]
dp[0][0] = 1
dp[0][1] = 0
for pi in range(p):
    dp[pi+1][0] = dp[pi][0] * 9
    dp[pi+1][1] = dp[pi][1] * 10 + dp[pi][0]
    

# 3がつかない3の倍数の個数を数える
compl = 3**(2*p-1) - 1

print(dp[p][1] + compl)