#include<bits/stdc++.h>
typedef long long ll;
typedef unsigned long long ull;
using namespace std;
#define pb push_back
int dy[]={0, 0, 1, -1, 1, 1, -1, -1};
int dx[]={1, -1, 0, 0, 1, -1, -1, 1};

#define FOR(i,a,b) for (int i=(a);i<(b);i++)
#define RFOR(i,a,b) for (int i=(b)-1;i>=(a);i--)
#define REP(i,n) for (int i=0;i<(n);i++)
#define RREP(i,n) for (int i=(n)-1;i>=0;i--)
#define mp make_pair
#define fi first
#define sc second
ull P;
ull dp[30][2][2][3];

int main(){
	cin >> P;

	ull a = 1;
	REP(i,P) {
		a *= 10;
	}

	string A = to_string(a);

	ull n = A.length();
	dp[0][0][0][0] = 1;

	REP(i,n) {
		REP(j,2) {
			REP(k,2) {
				REP(l,3) {
					ull 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];
					}
				}
			}
		}
	}
	ull ans = 0;
	REP(j,2) {
		REP(k,2) {
			REP(l,3) {
				if(k || !l) {
					ans += dp[n][j][k][l];
				}
			}
		}
	}
	cout << ans - 1 << endl;
	return 0;
}