#include <bits/stdc++.h>

using namespace std;

#define FOR(i,a,b) for(int i=(a);i<(b);i++)
#define REP(i,n) FOR(i,0,n)
#define ALL(v) (v).begin(),(v).end()

template<typename A, typename B> inline bool chmax(A &a, B b) { if (a<b) { a=b; return 1; } return 0; }
template<typename A, typename B> inline bool chmin(A &a, B b) { if (a>b) { a=b; return 1; } return 0; }

typedef unsigned long long ull;
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef pair<int, pii> P;

const ll INF = 1ll<<29;
const ll MOD = 1000000007;
const double EPS  = 1e-10;

int p;
ll dp[20][3][2];

ll dfs(int d, int m, bool f) {
	if (d == 0) return m == 0 || f;
	if (~dp[d][m][f]) return dp[d][m][f];
	
	ll res = 0;
	REP(i, 10) res += dfs(d - 1, (m * 10 + i) % 3, f || i == 3);
	
	return dp[d][m][f] = res;
}

int main() {
	cin >> p;
	
	memset(dp, -1, sizeof(dp));
	cout << dfs(p, 0, false) - 1 << endl;
	
	return 0;
}