func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n;     cin >> n;     if (n % 2 == 1) {       cout << (n - 1) / 2 << endl;     } else {       long long x = 1;       while (2 * x <= n) {         x *= 2;       }       cout << (n - x) / 2 << endl;     }     return 0;   }   