func_code_string: #include <bits/stdc++.h>   int main() {     long long n, m;     scanf( %lld %lld , &n, &m);     long long res = 1, p = 2;     while (m != 0) {       if (m % 2 != 0) res = res * p % 1000000007;       p = p * p % 1000000007;       m >>= 1;     }     res--;     p = res;     res = 1;     while (n != 0) {       if (n % 2 != 0) res = res * p % 1000000007;       p = p * p % 1000000007;       n >>= 1;     }     printf( %lld , res);     return 0;   }   