func_code_string: #include <bits/stdc++.h>   using namespace std;   long long pw(long long base, long long e) {     return e ? pw(base * base, e / 2) * (e % 2 ? base : 1) : 1;   }   long long gcd(long long a, long long b) { return b ? gcd(b, a % b) : a; }   long long to_int(string s) {     long long ret = 0;     for (int i = 0; i <= s.size(); i++) {       ret += pw(10, s.size() - i - 1) * (long long)(s[i] -  0 );     }     return ret;   }   const int maxn = 1e5 + 10, mod = 1e9 + 7;   const long long INF = 1e9;   long long n;   long long f(long long x) { return (n - x) / (2 * x); }   int main() {     cin >> n;     n--;     long long ans = 0;     for (int i = 0; i <= log2(n); i++) {       ans += pw(2, i) * (f(pw(2, i)) + 1);     }     return cout << ans <<   n , 0;   }   