func_code_string: #include <bits/stdc++.h>   using namespace std;   template <typename Arg1>   void __f(const char* name, Arg1&& arg1) {     cerr << name <<   :   << arg1 << std::endl;   }   template <typename Arg1, typename... Args>   void __f(const char* names, Arg1&& arg1, Args&&... args) {     const char* comma = strchr(names + 1,  , );     cerr.write(names, comma - names) <<   :   << arg1 <<   |  ;     __f(comma + 1, args...);   }   const int MOD = 1e9 + 7;   int main() {     ios::sync_with_stdio(0), cin.tie(0), cout.tie(0);     long long l, r;     long long ans = -1;     cin >> l >> r;     for (int i = 0; l > 0 || r > 0; ++i) {       if ((l & 1) != (r & 1)) ans = i;       l >>= 1;       r >>= 1;     }     cout << (1LL << (ans + 1)) - 1 <<   n ;     return 0;   }   