p = int(input())

dp = [0, 0, 0]
ans = 0
plus = 10 ** (p - 1)
for i in range(p):
    ans += (sum(dp) + 1) * plus
    plus //= 10
    ndp = [0] * 3
    for i in range(10):
        if i == 3:
            continue
        for j in range(3):
            ndp[(i + j) % 3] += dp[j]
    for i in range(1, 10):
        if i == 3:
            continue
        ndp[i % 3] += 1
    dp = ndp

print(ans + dp[0])