func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     cout.tie(NULL);     long long n, c = 0, ans;     cin >> n;     while (n) {       if (n % 2) c++;       n /= 2;     }     cout << c << endl;   }   