#include <bits/stdc++.h>   using namespace std;   unsigned long long int w, v, qt = 0, n;   inline unsigned long long int f(unsigned long long int x) {     return w * (1 - x) * (1 - x) + v;   }   int main() {     ios_base::sync_with_stdio(0);     cin.tie(0);     cin >> n >> v >> w;     char c;     while (cin >> c) qt += c ==  1 ;     unsigned long long int ans = (~0ULL);     for (int i = 1; i <= qt; i++) {       unsigned long long int tmp = 0;       tmp += (i - (n % i)) * f(n / i);       tmp += (n % i) * f(n / i + 1);       ans = min(ans, tmp);     }     cout << ans << endl;     return 0;   }   