#include <bits/stdc++.h>
using namespace std;
const int MOD=1e9+7;
int main() {
    int n;
    cin>>n;
    unsigned long long a[10]={0,1,2,3,4,5,6,7,8,9};

    long long sum=10;

    if(n==1){
        cout << 10 << endl;
        return 0;
    }
    while(--n){
        for(int i=2;i<10;++i){
            a[i]+=a[i-1];
            a[i]%=MOD;
        }
        sum+=a[9];
        sum%=MOD;
    }

    cout << sum << endl;
    return 0;
}