#include<iostream>
#include<cmath>
#include<algorithm>
using namespace std;

#define LL long long
LL dp[20]={1,3};
int main(){
	int p;
	cin>>p;
	LL res,ten=(LL)pow(10,p-1);
	res=ten;
	for(int i=2;i<=p;i++){
		ten/=10;
		dp[i]=dp[i-1]*9;
		res+=dp[i-1]*3*ten;
	}
	cout<<res+dp[p]-1<<endl;;


}