#include <iostream>
#include <vector>
#include <algorithm>
#include <cmath>

using namespace std;

int main()
{
  int n, a, b;
  cin >> n >> a >> b;
  vector<double> k(n + 1);
  for (int i = 0; i <= n; ++i) cin >> k[i];
  double ans = 0;
  for (int i = 0; i <= n; ++i)
  {
    double tmp = k[i] / (i + 1);
    for (int j = 0; j <= i; ++j) tmp *= b;
    ans += tmp;
    tmp = k[i] / (i + 1);
    for (int j = 0; j <= i; ++j) tmp *= a;
    ans -= tmp;
  }
  long long v = floor(ans);
  cout << v << endl;
}