#include <bits/stdc++.h>
#define FOR(i,bg,ed) for(ll i=(bg);i<(ed);i++)
#define REP(i,n) FOR(i,0,n)
#define MOD 1000000007
#define int long long
using namespace std;
typedef long long ll;
const int INF = 1e9;

int P;
int dp[30][2][2][3];    //pos, less, has3, mod3

signed main()
{
    cin >> P;

    string A = "1";
    REP(i,P) A += "0";
    int n = A.length();

    dp[0][0][0][0] = 1;
    REP(i,n) REP(j,2) REP(k,2) REP(l,3) {
        int lim = j ? 9 : A[i] - '0';
        REP(d, lim + 1) {
            dp[i+1][j || d < lim][k || d == 3][(l + d) % 3] += dp[i][j][k][l];
        }
    }

    int ans = 0;
    REP(j,2) REP(k,2) REP(l,3) {
        if (k || l == 0) {
            ans += dp[n][j][k][l];
        }
    }

    cout << ans - 1 << endl;
}