#include <bits/stdc++.h> using namespace std; long long a[11000], b[11000]; int main(){ int n; cin >> n; if(n == 1){ cout << 9; return 0; } a[1] = 8; b[1] = 1; for(int i = 2; i <= n; i++){ a[i] = a[i - 1] * 9 + b[i - 1]; b[i] = b[i - 1] * 9 + a[i - 1]; } cout << a[n]; return 0; }