#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int,int> pii;
#define pb push_back
#define mp make_pair
#define rep(i,n) for(int i=0;i<(n);++i)
const int mod=1000000007;

int main(){
	cin.tie(0);
	ios::sync_with_stdio(false);
	ll n;cin >> n;
	vector<vector<ll>> dp(10,vector<ll>(n+2));
	rep(i,9) dp[i+1][1]=1;
	for(int i=1;i<=n;++i){
		for(int j=1;j<=9;++j){
			for(int k=j;k<=9;++k){
				dp[j][i+1]+=dp[k][i];
				dp[j][i+1]%=mod;
			}
		}
	}
	ll ans=0;
	for(int i=1;i<=n;++i){
		for(int j=1;j<=9;++j){
			ans+=dp[j][i];
			ans%=mod;
		}
	}
	ans++;
	cout << ans << endl;
}