#include <atcoder/modint>
#include <iostream>
#include <vector>
using namespace std;

#define rep(i, n) for (int i = 0; i < n; i++)
using mint = atcoder::modint1000000007;
int main() {
    int n;
    cin >> n;
    vector<vector<mint>> dp(n, vector<mint>(10));
    rep(i, 10) dp[0][i]++;

    rep(i, n - 1) {
        rep(k, 10) {
            for (int j = k; j < 10; j++) dp[i + 1][j] += dp[i][k];
        }
    }

    mint ans = 0;
    rep(i, 10) ans += dp.back()[i];
    cout << ans.val() << endl;

    return 0;
}