import java.util.*;

public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int n = sc.nextInt();
    long MOD = (long)Math.pow(10, 9) + 7;
    long[][] dp = new long[n][10];
    for(int j = 0; j < 10; j++) {
      dp[0][j] = 1;
    }
    for(int i = 1; i < n; i++) {
      dp[i][0] = dp[i - 1][0]; 
      for(int j = 1; j < 10; j++) {
        dp[i][j] = (dp[i][j - 1] + dp[i - 1][j]) % MOD;
      }
    }
    long ans = 0;
    for(int j = 0; j < 10; j++) {
      ans = (ans + dp[n - 1][j]) % MOD;
    }
    System.out.println(ans);
  }
}