#include <algorithm>
#include <cassert>
#include <cctype>
#include <climits>
#include <cmath>
#include <complex>
#include <cstdio>
#include <cstring>
#include <deque>
#include <functional>
#include <iomanip>
#include <iostream>
#include <map>
#include <numeric>
#include <queue>
#include <random>
#include <set>
#include <stack>
#include <string>
#include <tuple>
#include <vector>
#define rep(i, n) for (int i = 0; i < (int)(n); ++i)
#define show(x) cerr << #x << " = " << (x) << endl;
using namespace std;
using ll = long long;
using pii = pair<int,int>;
ll mod = 1000000007;
int main(){
    ll ans = 1;
    ll n;
    cin >> n;
    rep(i,n){
        ans = (ans * 10 + 3) % mod;
    }
    cout << ans << endl;
}