#include <bits/stdc++.h>
using namespace std;

int main() {
  int N;
  cin >> N;
  int num;
  
  num = pow(10,N);
  for(int i = N - 1; i >= 0; i--){
    num = num + 3 * pow(10, i);
  }
  double ans = num % 1000000007;
  if(ans != 0 && num > 1000000007){
    cout << ans;
  }
  
  else if(ans != 0 && num < 1000000007){
    cout << num;
  }
  
  else{}
      
}