fn read<T: std::str::FromStr>() -> T {
    let mut s = String::new();
    std::io::stdin().read_line(&mut s).ok();
    s.trim().parse().ok().unwrap()
}

fn main() {
    let n: usize = read();
    let mut dp = vec![vec![0; 10]; n];
    let big_int = 1000_000_000 + 7;

    for j in 0..10 {
        dp[0][j] = 1;
    }

    for i in 0..n - 1 {
        dp[i + 1][0] = dp[i][0];
        for j in 1..10 {
            dp[i + 1][j] = dp[i][j] + dp[i + 1][j - 1];
            dp[i + 1][j] %= big_int;
        }
    }
    let mut ans = 0;
    for j in 1..10 {
        ans += dp[n - 1][j];
        ans %= big_int;
    }

    println!("{:?}", ans + 1);
}