p = int(input())

dp = [[[0] * 3 for i in range(2)] \
      for j in range(p + 2)]

dp[0][0][0] = 1
for i in range(p + 1):
    for j in range(2):
        for k in range(3):
            for n in range(10):
                new_j = 1 if j == 1 or n == 3 else 0
                dp[i + 1][new_j][(k * 10 + n) % 3] += dp[i][j][k]


print(dp[p][0][0] + sum(dp[p][1]) - 1)