#include "bits/stdc++.h"

using namespace std;

const int MOD = 1e9+7;

void solve()
{
	long N;
	cin>> N;
	int ans = 1;
	while(N--)
	{
		ans *= 10;
		ans += 3;
		ans %= MOD;
	}
	cout << ans<< endl;
}

int main(void)
{
	solve();
	//cout << "yui(*-v・)yui" << endl;
	return 0;
}