#include <algorithm>
#include <cmath>
#include <iostream>
#include <map>
#include <queue>
#include <set>
#include <string>
#include <vector>
#define rep(i, n) for (int i = 0; i < (n); i++)
#define rrep(i, n) for (int i = (n)-1; i >= 0; i--)
using namespace std;
typedef long long int lli;
lli MOD = 1000000007;
int main()
{
    int p;
    cin >> p;
    string s = "1";
    int n = p + 1;
    rep(i, p) s += "0";
    lli dp[25][2][3][2] = {};  //pos,less,mod,has3
    dp[0][0][0][0] = 1;
    rep(i, p + 1) rep(j, 2) rep(k, 3) rep(l, 2)
    {
        int lim = j ? 9 : s[i] - '0';
        rep(m, lim + 1)
        {
            dp[i + 1][j || m < lim][(k + m) % 3][l || m == 3] += dp[i][j][k][l];
        }
    }
    lli a = 0;
    rep(j, 2)
    {
        rep(l, 2)
        {
            rep(k, 3)
            {
                if (l || k == 0)
                    a += dp[p + 1][j][k][l];
            }
        }
    }

    cout << (a - 1) << endl;
}