from itertools import product

p = int(input())
n = str(10**p)
keta = p+1
dp = [[[[0]*2 for i in range(3)] for j in range(2)] for k in range(keta+1)]
dp[0][1][0][0] = 1
for i, j, k, l in product(range(keta), range(2), range(3), range(2)):
    top = int(n[i]) if j else 9
    for m in range(top+1):
        dp[i+1][int(j and m==top)][(k+m)%3][int(l or m == 3)] += dp[i][j][k][l]

ans = 0
for i in range(2):
    for j in range(2):
        ans += dp[-1][i][0][j]
    for j in range(3):
        ans += dp[-1][i][j][1]
    ans -= dp[-1][i][0][1]
print(ans-1)