#include <bits/stdc++.h>

using namespace std;

#define FOR(i,s,e) for(int (i)=(s);(i)<(int)(e);(i)++)
#define REP(i,e) FOR(i,0,e)
#define RFOR(i,e,s) for(int (i)=(e)-1;(i)>=(int)(s);(i)--)
#define RREP(i,e) RFOR(i,0,e)

#define all(o) (o).begin(), (o).end()
#define psb(x) push_back(x)
#define mp(x,y) make_pair((x),(y))

typedef long long ll;
typedef pair<int, int> PII;
typedef priority_queue<int> PQI;
typedef priority_queue<PII> PQII;

const double EPS = 1e-10;
const int P = 20;
int p;
ll dp[P+1][2][3][2];  //poss, less, mod 3, has 3

ll calc(string x) {
  int n = (int)x.size();
  memset(dp, 0, sizeof(dp));
  dp[0][0][0][0] = 1;
  REP(i,n) REP(j,2) REP(k,3) REP(l,2) {
    int lim = j ? 9 : x[i]-'0';
    REP(d,lim+1) dp[i+1][j || d<lim][(k*10+d)%3][l || d==3] += dp[i][j][k][l];
  }
  ll res = 0;
  REP(j,2) REP(k,3) REP(l,2)
    if (!k || l) res += dp[n][j][k][l];
  return res;
}

int main() {
  scanf("%d ", &p);
  string x = "1";
  REP(i,p) x += '0';
  printf("%lld\n", calc(x)-1);
  return 0;
}