func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n;     cin >> n;     unsigned long long ans = 1, ans2 = 1;     for (int i = 0; i < n; i++) {       ans = (ans * 27);       ans2 = (ans2 * 7);       if (ans2 > 1000000007 || ans % 1000000007 > ans2) {         ans %= 1000000007;         ans2 %= 1000000007;       }     }     cout << (1000000007 + ans - ans2) % 1000000007 << endl;   }   