#include <bits/stdc++.h>
#include <chrono>
#define ll long long int
#define endl '\n'
#define vn vector<ll>
#define vi vector<pair <ll,ll>>
using namespace std;
using namespace std::chrono;
const int MAX_N = 1e9 + 7;
#define pii pair<ll,ll>
const ll INF = 0x3f3f3f3f3f3f3f3f;
#define pb push_back
#define srt(vp) sort(vp.begin(), vp.end())
int main() {
ios::sync_with_stdio(false);
cin.tie(nullptr);
auto start = high_resolution_clock::now();
ll k,n,m,a,b;
cin>>k>>n>>m>>a>>b;
vn v(k+1);//v
for (int i=1;i<=k;i++)cin>>v[i];
vn s(n+1);//s
for (int i=1;i<=n;i++)cin>>s[i];
vn t(m+1);//t
for (int i=1;i<=m;i++)cin>>t[i];
map <ll,vn> pos;
set <ll> s2;
for (int i=1;i<=m;i++){
pos [t[i]].pb(i);
s2.insert(t[i]);
}
vector <vn> dp(n+1,vn(m+1,-MAX_N));
for (int i=0;i<=n;i++)dp[i][0]=0;
ll ans = a+m*b;
vn optimal (m+1,-MAX_N);
for (int i=1;i<=n;i++){
ll temp = -MAX_N;
if (s2.count(s[i])){
for (auto &x:pos[s[i]]){
dp[i][x]=max(dp[i][x],dp[i-1][x-1]+v[s[i]]);
dp[i][x]=max(dp[i][x],a+v[s[i]]);
}
}
for (int j=1;j<=m;j++){
optimal [j]= max(dp[i][j],optimal[j]);
dp[i][j]=max(dp[i][j],optimal[j]+a);
temp = max(dp[i][j],temp);
dp[i][j]=max(dp[i][j],temp + a);
}
for (int j=1;j<=m;j++){
ans=max(ans,dp[i][j]+(j != m)*a);
}
}
cout<<ans<<endl;
auto stop = high_resolution_clock::now();
auto duration = duration_cast<microseconds>(stop - start);
//cout << "Time taken by function: " << duration.count() << " microseconds" << endl;
return 0;
}
