#include <stdio.h>
#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using mint = modint1000000007;
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf 1000000000000000

int main(){	
	
	int P;
	cin>>P;
	
	vector dp(3,vector<long long>(2,0));
	dp[0][0] = 1;
	
	rep(i,P){
		vector ndp(3,vector<long long>(2,0));
		rep(j,3){
			rep(k,2){
				rep(l,10){
					int nj = (j+l)%3;
					int nk = k;
					if(l==3)nk = 1;
					ndp[nj][nk] += dp[j][k];
				}
			}
		}
		swap(dp,ndp);
	}
	long long ans = 0;
	rep(i,3){
		rep(j,2){
			if(i==0||j)ans += dp[i][j];
		}
	}
	ans--;
	cout<<ans<<endl;
	
	return 0;
	
}