#include <bits/stdc++.h>
using namespace std;

int main() {
    int64_t n, mod = 1000000007;
    cin >> n;
    int64_t dp[n + 1][10]{};
    dp[0][0] = 1;
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < 10; j++) {
            for (int k = j; k < 10; k++) {
                (dp[i + 1][k] += dp[i][j]) %= mod;
            }
        }
    }
    int64_t ans = 0;
    for (int i = 0; i < 10; i++) {
        (ans += dp[n][i]) %= mod;
    }
    cout << ans << endl;
    return 0;
}