#include<bits/stdc++.h>
using namespace std;
using i64 = long long;
const int inf = 1e9;
int main(){
ios_base::sync_with_stdio(false);
cin.tie(NULL);
int k,n,m,a,b;
cin >> k >> n >> m >> a >> b;
a *= -1;
b *= -1;
vector<int> v(k + 2),s(n + 2),t(m + 2);
for(int i = 1;i <= k;i++){
cin >> v[i];
}
vector<vector<int>> hs(k + 1);
for(int i = 1;i <= n;i++){
cin >> s[i];
hs[s[i]].push_back(i);
}
for(int i = 1;i <= m;i++){
cin >> t[i];
}
/*
dp[i][j][x] -> max happiness if start at day i and at index j(on t)
x = 0 -> no behind in t
x = 1 -> just behind in t
x = 2 -> far behind in t
*/
vector<vector<int>> dp(n + 4,vector<int>(3,-inf));
vector<vector<int>> ndp(n + 4,vector<int>(3,-inf));
vector<vector<int>> ndp2(n + 4,vector<int>(3,-inf));
int ans = -m * b - a;
for(int j = m;j >= 1;j--){
int hs2 = -1;
int nx1 = -inf;
int nx2 = -inf;
for(int i = n;i >= 1;i--){
for(int x = 0;x <= 2;x++){
int tot = -inf;
if(s[i] == t[j]) hs2 = i;
if(s[i + 1] == t[j]){
nx1 = max(nx1,ndp[i + 2][1] - (i + 1) * b);
}
if(s[i + 1] == t[j]){
nx2 = max(nx2,ndp2[i + 2][2] - (i + 1) * b);
}
// leave at eth day
if(hs2 != -1){
int sub = (hs2 - i) * b + ((hs2 > i) ? a : 0);
tot = max(tot,v[t[j]] - sub - (m - j) * b - ((m > j) ? a : 0));
}
tot = max(tot,nx1 + i * b + v[t[j]] - a);
if(s[i] == t[j]){
tot = max(tot,ndp[i + 1][1] + v[t[j]]);
}
tot = max(tot,nx2 + i * b + v[t[j]] - a + (j + 1) * b - a);
if(s[i] == t[j]){
tot = max(tot,ndp2[i + 1][2] + v[t[j]] + (j + 1) * b - a);
}
if(x == 2){
tot -= j * b;
}
// skip t[j]
if(x == 2) tot = max(tot,ndp[i][2]);
dp[i][x] = tot;
}
ans = max(ans,dp[i][0] - (j - 1) * b - ((j > 1) ? a : 0));
}
ndp2 = ndp;
ndp = dp;
}
cout << ans << '\n';
return 0;
}
