#include <bits/stdc++.h>
#define rep(i,n) for(int i = 0; i < (n); i++)
using namespace std;
using ll = long long;
using ld = long double;

int main(){
    cin.tie(0);
    ios::sync_with_stdio(0);
    
    int P; cin >> P;
    ll pow10 = 1, pow9 = 1;
    rep(_,P) pow10 *= 10, pow9 *= 9;
    cout << pow10 - 1 - pow9 / 3 * 2 << endl;
}