#pragma GCC target("avx2")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#include<iostream>
#include<vector>
#include<cstddef>
#include<cstdint>
using namespace std;
using i32 = int_fast32_t;
using i64 = int_fast64_t;
using usize = size_t;
#define rep(i, n) for (size_t i = 0; i < (size_t)(n); i++)
#define all(a) (a).begin(),(a).end()
#define rall(a) (a).rbegin(),(a).rend()
using P = pair<i64,i64>;
constexpr usize MOD = 1e9 + 7;
int main(){
ios::sync_with_stdio(false);
std::cin.tie(nullptr);
usize n;
cin >> n;
vector<vector<i64>> dp(n,vector<i64>(10,0));
rep(i,10){
    dp[0][i] = 1;
}
rep(i,n - 1){
    rep(j,10){
        for(usize k = j; k < 10; k++){
            dp[i + 1][k] = (dp[i + 1][k] + dp[i][j]) % MOD;
        }
    }
}
usize ans = 0;
rep(i,10){
    ans = (ans + dp[n - 1][i]) % MOD;
}
/*rep(i,n){
    rep(j,10){
        cout << dp[i][j] << " \n"[j == 9];
    }
}*/
cout << ans << endl;
}