S = input()
N = int(S)
n = list(map(int,list(S)))

import sys
if N <= 99:
    ans = 0
    for i in range(10,N+1):
        a = i % 10
        b = i // 10
        if (a+b) % 3 == 0:
            ans += 1
    print(ans)
    exit()
under = 14
dp = [[0] * 2 for _ in range(len(S))]
if n[0] % 3 == 0:
    dp[0][1] = 1
else:
    dp[0][1] = 0
dp[0][0] = 1
if n[0] > 3:dp[0][0] += 1
if n[0] > 6:dp[0][0] += 1
for i in range(1,len(S)):
    dp[i][0] += dp[i-1][0] * 4
    if n[i] % 3 == 0:
        dp[i][1] = dp[i-1][1]
    else:
        dp[i][1] = 0
    count = 0
    if n[i] > 0:count += 1
    if n[i] > 3:count += 1
    if n[i] > 6:count += 1
    dp[i][0] += dp[i-1][1] * count
print(dp[len(S)-1][0] + dp[len(S)-1][1] + under)