#include "bits/stdc++.h"
using namespace std;
typedef long long ll;

string make_str(int p) {
    string s = "1";
    for (int _ = 0; _ < p; _++) {
        s += "0";
    }
    return s;
}

int main() {
    int p; cin >> p;
    string s = make_str(p);
    // dp[i][mod3][3flag][smaller]
    vector<vector<vector<vector<ll>>>> dp(s.size() + 1, vector<vector<vector<ll>>>(3, vector<vector<ll>>(2, vector<ll>(2, 0))));
    dp[0][0][0][0] = 1;
    for (int i = 0; i < s.size(); i++) {
        for (int j = 0; j < 3; j++) {
            dp[i + 1][(j + s[i] - '0') % 3][0][0] += dp[i][j][0][0];
            for (int k = 0; k < 10; k++) {
                if (k == 3) continue;
                dp[i + 1][(j + k) % 3][0][1] += dp[i][j][0][1];
            }
            for (int k = 0; k < s[i] - '0'; k++) {
                if (k == 3) continue;
                dp[i + 1][(j + k) % 3][0][1] += dp[i][j][0][0];
            }
            dp[i + 1][j][1][1] += dp[i][j][0][1];
            for (int k = 0; k < 10; k++) {
                dp[i + 1][(j + k) % 3][1][1] += dp[i][j][1][1];
                if (k < s[i] - '0') dp[i + 1][(j + k) % 3][1][1] += dp[i][j][1][0];
            }
            if (s[i] > '3') dp[i + 1][j][1][1] += dp[i][j][0][0];
        }
    }
    ll ans = 0;
    for (int i = 0; i < 3; i++) {
        for (int j = 0; j < 2; j++) {
            for (int k = 0; k < 2; k++) {
                if (i == 0 || j == 1) {
                    ans += dp[s.size()][i][j][k];
                }
            }
        }
    }
    cout << ans - 1 << endl;
    return 0;
}