func_code_string: #include <bits/stdc++.h>   using namespace std;   long long n, m;   long long q_pow(long long a, long long b, long long c) {     if (b == 0) return 1;     long long ret = q_pow(a, b / 2, c);     ret = (ret * ret) % c;     if (b & 1) ret = (ret * a) % c;     return ret;   }   int main() {     scanf( %d%d , &n, &m);     long long ans = (q_pow(3, n, m) + m - 1) % m;     cout << ans << endl;     return 0;   }   