#include<bits/stdc++.h>
using namespace std;
#define ALL(x) x.begin(),x.end()
#define rep(i,n) for(int i=0;i<(n);i++)
#define debug(v) cout<<#v<<":";for(auto x:v){cout<<x<<' ';}cout<<endl;
#define INF 1000000000
#define mod 1000000007
using ll=long long;
const ll LINF=1001002003004005006ll;
int dx[]={1,0,-1,0};
int dy[]={0,1,0,-1};
// ll gcd(ll a,ll b){return b?gcd(b,a%b):a;}
template<class T>bool chmax(T &a,const T &b){if(a<b){a=b;return true;}return false;}
template<class T>bool chmin(T &a,const T &b){if(b<a){a=b;return true;}return false;}

signed main(){
    cin.tie(0);
    ios::sync_with_stdio(0);
    
    int n,m;cin>>n>>m;
    vector<int> v(n),r(m);
    rep(i,n) cin>>v[i];
    rep(i,m) cin>>r[i];
    ll A,B;cin>>A>>B;

    vector<ll> dv(200001,0),dr(200001,0);
    dv[0]=1;dr[0]=1;
    rep(i,n){
        vector<ll> nxt(200001,0);
        for(int j=200000;j>=0;j--){
            nxt[j]+=dv[j];
            if(j-v[i]>=0) nxt[j]+=dv[j-v[i]];
            nxt[j]%=mod;
        }
        swap(nxt,dv);
    }
    rep(i,m){
        vector<ll> nxt(200001,0);
        for(int j=200000;j>=0;j--){
            nxt[j]+=dr[j];
            if(j-r[i]>=0) nxt[j]+=dr[j-r[i]];
            nxt[j]%=mod;
        }
        swap(nxt,dr);
    }

    dv[0]=0;dr[0]=0;

    vector<ll> sum(200001,0);
    ll k=0;
    rep(i,200001){
        k+=dv[i];k%=mod;
        sum[i]=k;
    }

    // rep(i,20) cout<<dv[i]<<" ";cout<<endl;
    // rep(i,20) cout<<dr[i]<<" ";cout<<endl;
    // rep(i,20) cout<<sum[i]<<" ";cout<<endl;

    // auto solve=[&](ll T,bool f=false){
    //     ll ret=0;
    //     for(ll i=0;i<200000;i++){
    //         ll j=min(200000ll-1ll,i*T);
    //         ret+=sum[j]*dr[i]%mod;
    //         ret%=mod;
    //     }
    //     return ret;
    // };

    // cout<<solve(B)-solve(A-1)<<endl;

    ll ans=0,mi=0;
    for(ll i=0;i<200000;i++){
        ll j=min(200000ll,i*B);
        ans+=sum[j]*dr[i]%mod;
        ans%=mod;

        ll k=min(200000ll,i*A);
        mi+=sum[k-1]*dr[i]%mod;
        mi%=mod;
    }
    // cout<<ans<<" "<<mi<<endl;
    cout<<(ans+mod-mi)%mod<<endl;
    return 0;
}