using System;
using static System.Console;
using static System.Math;

public class Hello{
    public static void Main(){
        int kazu = int.Parse(ReadLine());
        long[] hako = new long[10]{1,1,1,1,1,1,1,1,1,1};
        for(int i=1;i<kazu;i++){
            for(int j=1;j<9;j++){
                hako[j] = hako[j-1] + hako[j];
                hako[j]%=1000000007;
            }
            hako[9] += hako[8];
            hako[9] %= 1000000007;
        }

        long ans=0;
        for(int i=0;i<10;i++){
            ans+=hako[i];
//            WriteLine(hako[i]);
        }
        ans%=1000000007;
        WriteLine(ans);
    }
}