#include <bits/stdc++.h>
using namespace std;
using ll = long long;
template <class T, class U> using Pa = pair<T, U>;
template <class T> using vec = vector<T>;
template <class T> using vvec = vector<vec<T>>;

constexpr ll mod = 1e9+7;
struct mint {
    ll x;
    mint(ll x=0):x((x%mod+mod)%mod){}
    
    friend ostream &operator<<(ostream& os,const mint& a){
        return os << a.x;
    }

    friend istream &operator>>(istream& is,mint& a){
        ll t;
        is >> t;
        a = mint(t);
        return (is);
    }

    mint& operator+=(const mint a) {
        if ((x += a.x) >= mod) x -= mod;
        return *this;
    }
    mint& operator-=(const mint a) {
        if ((x += mod-a.x) >= mod) x -= mod;
        return *this;
    }
    mint& operator*=(const mint a) {
        (x *= a.x) %= mod;
        return *this;
    }
    mint operator+(const mint a) const {
        mint res(*this);
        return res+=a;
    }
    mint operator-(const mint a) const {
        mint res(*this);
        return res-=a;
    }
    mint operator*(const mint a) const {
        mint res(*this);
        return res*=a;
    }
    mint pow(ll t) const {
        if (!t) return 1;
        mint a = pow(t>>1);
        a *= a;
        if (t&1) a *= *this;
        return a;
    }
    // for prime mod
    mint inv() const {
        return pow(mod-2);
    }
    mint& operator/=(const mint a) {
        return (*this) *= a.inv();
    }
    mint operator/(const mint a) const {
        mint res(*this);
        return res/=a;
    }
};

int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);
    int N,M;
    cin >> N >> M;
    vec<int> V(N),R(M);
    for(int i=0;i<N;i++) cin >> V[i];
    for(int i=0;i<M;i++) cin >> R[i];
    ll A,B;
    cin >> A >> B;
    int ma = 100010;
    vec<mint> dp(ma+2);
    dp[0] = 1;
    for(int i=0;i<N;i++){
        vec<mint> ndp(ma);
        for(int j=0;j<ma;j++){
            ndp[j] += dp[j];
            if(j+V[i]<=ma) ndp[j+V[i]] += dp[j];
        }
        dp.swap(ndp);
    }
    for(int i=0;i<ma;i++) dp[i+1] += dp[i];
    vec<mint> rdp(ma);
    rdp[0] = 1;
    for(int i=0;i<M;i++){
        vec<mint> ndp(ma);
        for(int j=0;j<ma;j++){
            ndp[j] += rdp[j];
            if(j+R[i]<=ma) ndp[j+R[i]] += rdp[j];
        }
        rdp.swap(ndp);
    }
    mint ans = 0;
    for(int i=1;i<ma;i++){
        ll l = min((ll) ma,A*i),r = min((ll) ma,B*i);
        ans += (dp[r]-dp[l-1])*rdp[i];
    }
    cout << ans << "\n";
}