func_code_string: #include <bits/stdc++.h>   using namespace std;   const long long N = 1e9 + 7;   const int P = 1e6 + 9;   long long n, m;   long long bin_pow(int a, int x) {     if (x == 1) return a % N;     if (x % 2 == 0) return (bin_pow(a, x / 2) * bin_pow(a, x / 2)) % N;     if (x % 2 != 0) return (bin_pow(a, x - 1) * (a % N)) % N;   }   int main() {     cin >> n >> m;     cout << bin_pow(bin_pow(2, m) - 1, n);   }   