func_code_string: #include <bits/stdc++.h>   using namespace std;   const long long mod = 1000000007LL;   long long dp[64];   long long solve(long long k) {     if (dp[k] != -1) return dp[k];     if (k == 0) return 1LL;     return ((16LL * solve(k - 1) % mod) * (solve(k - 1) % mod) % mod + mod) % mod;   }   int main() {     ios::sync_with_stdio(false);     cin.tie(NULL);     cout.tie(NULL);     long long k;     cin >> k;     for (int i = (0); i < (64); i++) dp[i] = -1;     cout << ((6LL * solve(k - 1)) % mod + mod) % mod << endl;     return 0;   }   