func_code_string: #include <bits/stdc++.h>   using namespace std;   long long n, m, w, r, k, i, j, s, q, x, y, l, a[22000];   int main() {     ios_base::sync_with_stdio(0);     cin >> n;     for (i = 1; i <= n; i++) {       cin >> a[i], s += a[i];       if (a[i] < 0) k = 1;     }     if (k == 0) {       cout << s;       return 0;     }     for (l = 2; l <= n; l++)       if (n % l == 0 && n / l >= 3)         for (j = 1; j <= l; j++) {           m = 0;           for (i = j; i <= n; i += l) m += a[i];           s = max(s, m);         }     cout << s;   }   