#include<iostream>
#include<algorithm>
#include<functional>
#include<string>
#include<vector>
#include<map>
#include<set>
#include<tuple>
#include<stack>
#include<queue>
#include<deque>
#include<sstream>
#include<stdio.h>
#include<math.h>
#include<stdlib.h>
#include<bitset>
#include<time.h>
#include<cstdlib>
#include<cassert>
#define ll long long
#define fi first
#define se second
using namespace std;
                   
int n;
string s;
ll dp[30][2][2][3];

int main(){
  ios::sync_with_stdio(false);
  cin.tie(0);
  cout.precision(10);
  cout<<fixed;
#ifdef LOCAL_DEFINE
    freopen("in", "r", stdin); 
    freopen("out","w",stdout);
#endif
  cin>>n;
  s="1";
  for(int i=0;i<n;i++)s+='0';
  n++;
  dp[0][0][0][0]=1;
  for(int i=0;i<n;i++){
    for(int j=0;j<2;j++){
      for(int k=0;k<2;k++){
        for(int l=0;l<3;l++){
          int lim=j?9:s[i]-'0';
          for(int d=0;d<lim+1;d++){
            dp[i+1][j || d<lim][k || d==3][(10*l+d)%3]+=dp[i][j][k][l];
          }
        }
      }
    }
  }
  ll ans=dp[n][0][0][0]+dp[n][1][0][0];
  for(int i=0;i<2;i++){
    for(int j=0;j<3;j++){
      ans+=dp[n][i][1][j];
    }
  }
  cout<<--ans<<"\n";
#ifdef LOCAL_DEFINE
    cerr << "Time elapsed: " << 1.0 * clock() / CLOCKS_PER_SEC << " s.\n";
#endif
  return 0;
}