func_code_string: #include <bits/stdc++.h>   using namespace std;   int putere(long long int a, long long int b) {     if (b == 0) {       return 1;     } else {       if (b == 1)         return a % 1000000007;       else {         long long int r;         r = putere(a, b / 2);         r = (r * r) % 1000000007;         if (b % 2 == 0)           return r;         else           return (r * a) % 1000000007;       }     }   }   int main() {     long long int x, k, nr1, nr2;     scanf( %lld%lld , &x, &k);     if (x == 0)       printf( 0 );     else {       x = x % 1000000007;       nr1 = putere(2, k);       nr2 = nr1 * x * 2 % 1000000007;       printf( %lld , (nr2 - nr1 + 1 + 1000000007) % 1000000007);     }     return 0;   }   