const DIVISOR: usize = 1_000_000_007;

fn main() {
    let mut n = String::new();
    std::io::stdin().read_line(&mut n).ok();
    let n: usize = n.trim().parse().unwrap();

    let mut dp: Vec<Vec<usize>> = vec![vec![0; 10]; n];
    for rank in 0..n {
        dp[rank][9] = 1;
        for i in (0..9).rev() {
            if rank == 0 {
                dp[rank][i] = 10 - i;
            } else {
                dp[rank][i] = dp[rank-1][i] + dp[rank][i+1];
            }
            dp[rank][i] %= DIVISOR;
        }
    }
    println!("{}", dp[n-1][0]);
}