#include <bits/stdc++.h>

#define int long long
#define ll long long
#define ld long double
#define endl '\n'
#define st first
#define nd second
#define pb push_back
#define sz(x) (int)(x).size()
#define all(x) (x).begin(), (x).end()
using namespace std;
int inf=1000000000007;
int mod=1000000007;
int mod1=998244353;

const int N=200007;

map<int,vector<int>>M;

vector<pair<int,int>>W[N];
int DP[N];
int val[N];

void add(int l,int r,int c)
{
   // cout<<"JEST "<<l<<" "<<r<<" "<<c<<endl;
    W[r].pb({l,c});
}

signed main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int x,n,m,w,t;
    cin>>x>>n>>m>>w>>t;
    int ans=x/t+1;
    for(int i=1;i<=n;i++)
    {
        int a;
        cin>>a;
        M[a/t].pb(a%t);
    }
    M[x/t].pb(x%t);
    vector<pair<int,int>>C(m+1);
    C[0].st=-inf;
    for(int i=1;i<=m;i++)
    {
        cin>>C[i].st>>C[i].nd;
        ans+=(x-C[i].st)/t+1;
    }
    ans*=w;
    sort(all(C));
    for(auto [p,y]:M)
    {
        vector<int>V=y;
        sort(all(V));
        int l=1;
        for(auto i:V)
        {
            int r=--lower_bound(all(C),make_pair(i,0LL))-C.begin();
            if(l<=r) add(l,r,p);
            l=r+1;
        }
    }
    for(int i=1;i<=m;i++) val[i]=inf;
    for(int i=1;i<=m+1;i++)
    {
        int S=0;
        DP[i]=inf;
        for(int j=i-1;j>=0;j--)
        {
            DP[i]=min(DP[i],DP[j]+S);
            S+=C[j].nd;
            S-=((x-C[j].st)/t+1-val[j])*w;
        }
        for(auto [l,c]:W[i])
        {
            for(int j=l;j<=i;j++) val[j]=min(val[j],c);
        }
    }
    cout<<ans+DP[m+1]<<endl;
    return 0;
}
/*
19 1 4 8 7
10
1 20
2 10
4 5
6 5
*/