func_code_string: #include <bits/stdc++.h>   using namespace std;   const int64_t mod = 1000000007;   int main() {     int n;     cin >> n;     int64_t ways = 1;     for (int i = 0; i < 3 * n; ++i) {       ways *= 3;       ways %= mod;     }     int64_t bad = 1;     for (int i = 0; i < n; ++i) {       bad *= 7;       bad %= mod;     }     cout << (mod + (ways - bad) % mod) % mod << endl;     return 0;   }   