func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n;     long long s = 0;     cin >> n;     for (int i = 2; i <= n / 2; i++) {       for (int j = 2; j * i <= n; j++) s += 4 * j;     }     cout << s << endl;     return 0;   }   