#include<bits/stdc++.h>
#define int long long
using namespace std;
#define rep(i,n) for(int i=0;i<(n);++i)
#define INF (1ll<<60)
typedef pair<int, int> pii;
#define FI first
#define SE second
#define all(s) s.begin(),s.end()
#define RREP(i,n) for(int i=(n)-1;i>=0;--i)

int P;
int dp[20][2][3];

signed main() {
	cin >> P;
	dp[0][0][0] = 1;
	rep(i,P)
	{
		rep(j,2)
		{
			rep(k,3)
			{
				int lim = 9;
				rep(d,lim+1)
				{
					dp[i + 1][j || d == 3][(k + d) % 3] += dp[i][j][k];
				}
			}
		}
	}
	int ans = 0;

	rep(k,3)
	{
		ans += dp[P][1][k];
	}
	ans += dp[P][0][0];

	cout << ans - 1 << endl;
}