#include<bits/stdc++.h>
using namespace std;
using ll = long long;
int n;

int main() {
	cin >> n;
	ll ans = 1;
	for(int i = 0;i<n;i++){
		ans *= 10;
	}
	ll tmp = 2;
	for(int i = 0;i<n*2-1;i++){
		tmp *= 3;
	}
	ans--;
	ans -= tmp;
	cout<<ans<<endl;
}