use std::io;

fn main(){
  let mut buf = String::new();
  io::stdin().read_line(&mut buf).expect("failed to read.");
  let n: usize = buf.trim().parse().unwrap();

  let p: usize = 1000000007;
  let mut v: Vec<usize> = vec![1,1,1,1,1,1,1,1,1,1];

  for _ in 1..n {
    for i in 1..10 {
      v[i] = (v[i] + v[i-1]) % p
    }
  }

  let ans: usize = v.iter().sum();

  println!("{}", ans % p);
}