func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     long long n;     cin >> n;     vector<long long> V;     for (long long i = 1; i * i <= n; ++i) {       if (!(n % i)) {         V.push_back(i);         V.push_back(n / i);       }     }     sort(V.begin(), V.end());     for (long long i = V.size() - 1; i >= 0; --i)       if (i == V.size() - 1 || V[i + 1] != V[i])         cout << n * (2 + V[i] * (n / V[i] - 1)) / 2 / V[i] <<    ;     cout << endl;   }   