#include <bits/stdc++.h>
using namespace std;
 
typedef long long ll;
typedef pair<int,int> P;
 
const int INF = 1e9;
const int mod = 1e9+7;
const double EPS = 1e-10;
const double PI = acos(-1.0);

int main()
{
    ll n;
    cin >> n;
    ll res = 1;
    /*for(int i = 1; i <= n; i++){
        ll base = 1;
        for(int j = 0; j < i; j++){
            base *= 10;
            base += 3;
            base %= mod;
        }
        cout << base << endl;
    }*/
    for(int i = 0; i < n; i++){
        res *= 10;
        res += 3;
        res %= mod;
    }
    cout <<res << endl;
    return 0;
}