P = int(input())

dp = [[[0] * 2 for _ in range(3)] for _ in range(P)]
for i in range(10):
    if i == 3:
        dp[0][0][1] = 1
    else:
        dp[0][i%3][0] += 1
for i in range(P-1):
    for j in range(3):
        for k in range(10):
            if k == 3:
                dp[i+1][(j*10+k)%3][1] += dp[i][j][0] + dp[i][j][1]
            else:
                dp[i+1][(j*10+k)%3][0] += dp[i][j][0]
                dp[i+1][(j*10+k)%3][1] += dp[i][j][1]
ans = dp[-1][0][1] + dp[-1][1][1] + dp[-1][2][1] + dp[-1][0][0]
print(ans-1)