#include <bits/stdc++.h>
using namespace std;

#define DUMP(x) cerr << #x << "=" << x << endl
#define DUMP2(x, y) cerr<<"("<<#x<<", "<<#y<<") = ("<<x<<", "<<y<<")"<< endl
#define BINARY(x) static_cast<bitset<16> >(x)

#define rep(i,n) for(int i=0;i<(int)(n);i++)
#define REP(i,m,n) for (int i=m;i<(int)(n);i++)

#define in_range(x, y, w, h) (0<=(int)(x) && (int)(x)<(int)(w) && 0<=(int)(y) && (int)(y)<(int)(h))
#define ALL(a) (a).begin(),(a).end()

typedef long long ll;
const int INF = 1e9;
typedef pair<int, int> PII;
int dx[4]={0, -1, 1, 0}, dy[4]={-1, 0, 0, 1};

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

int main()
{
    int P;
    cin >> P;

    // dp[i桁目まで][3があるか][mod3]
    dp[0][0][0] = 1;
    rep(i, P) rep(j, 2) rep(k, 3) {
        rep(d, 10) {
            dp[i+1][j | (d == 3)][(k * 10 + d) % 3] += dp[i][j][k];
        }
    }

    ll res = 0LL;
    rep(j, 2) rep(k, 3) {
        if (j || k == 0) res += dp[P][j][k];
    }
    cout << res - 1 << endl;
}