func_code_string: #include <bits/stdc++.h>   using namespace std;   const int N = 100005;   long long i, j, n;   int ar[N];   int main() {     for (int i = 2; i < N; i++) {       for (int j = i + i; j < N; j += i) {         ar[j] += j / i;       }     }     cin >> n;     long long sum = 0;     for (int i = 2; i <= n; i++) sum += ar[i];     cout << 4 * sum << endl;   }   