#include <bits/stdc++.h>
using namespace std;
typedef signed long long ll;

#undef _P
#define _P(...) (void)printf(__VA_ARGS__)
#define FOR(x,to) for(x=0;x<to;x++)
#define FORR(x,arr) for(auto& x:arr)
#define ITR(x,c) for(__typeof(c.begin()) x=c.begin();x!=c.end();x++)
#define ALL(a) (a.begin()),(a.end())
#define ZERO(a) memset(a,0,sizeof(a))
#define MINUS(a) memset(a,0xff,sizeof(a))
//-------------------------------------------------------

int N;
ll p10[19];
map<int,ll> M[3];

ll hoge(int v,int mo) {
	if(v==0) return mo==2;
	if(M[mo].count(v)) return M[mo][v];
	
	ll ret=0;
	for(int i=0;i<=9;i++) {
		if(i==3) ret += p10[v-1];
		else ret += hoge(v-1,(i+mo)%3);
	}
	
	return M[mo][v]=ret;
}


void solve() {
	int i,j,k,l,r,x,y; string s;
	
	p10[0]=1;
	FOR(i,18) p10[i+1]=p10[i]*10;
	
	cin>>N;
	cout<<hoge(N,0)-1<<endl;
}


int main(int argc,char** argv){
	string s;int i;
	if(argc==1) ios::sync_with_stdio(false);
	FOR(i,argc-1) s+=argv[i+1],s+='\n';
	FOR(i,s.size()) ungetc(s[s.size()-1-i],stdin);
	solve(); return 0;
}