#include"bits/stdc++.h"

//#include<bits/stdc++.h>
using namespace std;
#define print(x) cout<<x<<endl;
#define rep(i,a,b) for(int i=a;i<b;i++)
typedef long long ll;
const ll mod = 10000000000;

int main(){
	int dp[20][2][2][3] = {};
	int n;
	cin >> n;
	n += 1;
	string a="10";
	rep(i, 1, n) {
		a += "0";
	}

	dp[0][0][0][0] = 1;
	rep(i, 0, n)rep(j, 0, 2)rep(k, 0, 2)rep(l, 0, 3) {
		int lim = j ? 9 : a[i] - '0';
		rep(d, 0, lim + 1) {
			dp[i + 1][j || d < lim][k || d == 3][(l + d) % 3] += dp[i][j][k][l];
		}
	}
	int ans = 0;
	rep(j, 0, 2)rep(k, 0, 2)rep(l, 0, 3) {
		if (k || l == 0) { ans += dp[n][j][k][l]; }
	}
	ans--;
	print(ans);
	return 0;
}