func_code_string: #include <bits/stdc++.h>   const int maxi = 2000000000;   const int maxq = 1000000000;   const double eps = 1e-10;   const double pi = 3.1415926535897932;   const double inf = 1e+18;   const int mo = 1000000007;   using namespace std;   long long l, r;   int main() {     cin >> l >> r;     if (l == r) {       puts( 0 );       return 0;     }     for (int i = 62; i >= 0; i--) {       if ((1ll << (i)) > l && (1ll << (i)) <= r) {         cout << (1ll << (i + 1)) - 1 << endl;         return 0;       }       if ((1ll << (i)) <= l) {         l -= (1ll << (i));         r -= (1ll << (i));       }     }     return 0;   }   