#include <bits/stdc++.h>
using namespace std;
// 定積分は微分するとf(x)になるg(x)(ただし定数項=0)にてg(B)-g(A)で求まるらしい

int main(){
#define int long long
	int n,x,y; cin >> n >> x >> y;
	vector<pair<int,int>> A(n+1); for (int i(0);auto& [a,b]:A) (cin>>a),b = ++i;
	long double r = 0;
	for (int i(0),k(x);i <= n;++i,k*=x) r -= ((long double)A[i].first*k)/A[i].second;
	for (int i(0),k(y);i <= n;++i,k*=y) r += ((long double)A[i].first*k)/A[i].second;
	cout << floor(r) << endl;
}