#include <bits/stdc++.h>
using namespace std;
const int N = 105;
int a[N];
int main(){
int n; cin >> n;
int ans = 0;
for(int i = 1; i <= n;i++){
cin >> a[i];
}
int date; cin >> date;
int fine; cin >> fine;
int flag = (date%2);
for (int i = 1; i <= n;i++){
if(flag){
if (a[i]%2==0) ans += fine;
}else{
if (a[i]%2==1) ans += fine;
}
}
cout << ans;
}
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