#include <iostream>
#include <vector>
#include <algorithm>
#include <cmath>
#include <queue>
#include <string>
#include <map>
#include <set>
#include <stack>
#include <tuple>
#include <deque>
#include <array>
#include <numeric>
#include <bitset>
#include <iomanip>
#include <cassert>
#include <chrono>
#include <random>
#include <limits>
#include <iterator>
#include <functional>
#include <sstream>
#include <fstream>
#include <complex>
#include <cstring>
#include <unordered_map>
using namespace std;

using ll = long long;
using P = pair<int, int>;
constexpr int INF = 1001001001;
constexpr int mod = 1000000007;
// constexpr int mod = 998244353;

template<class T>
inline bool chmax(T& x, T y){
    if(x < y){
        x = y;
        return true;
    }
    return false;
}
template<class T>
inline bool chmin(T& x, T y){
    if(x > y){
        x = y;
        return true;
    }
    return false;
}

struct mint {
    int x;
    mint() : x(0) {}
    mint(int64_t y) : x(y >= 0 ? y % mod : (mod - (-y) % mod) % mod) {}
    mint& operator+=(const mint& p){
        if((x += p.x) >= mod)   x -= mod;
        return *this;
    }
    mint& operator-=(const mint& p){
        if((x -= p.x) < 0)  x += mod;
        return *this;
    }
    mint& operator*=(const mint& p){
        x = (int)(1LL * x * p.x % mod);
        return *this;
    }
    mint& operator/=(const mint& p){
        *this *= p.inverse();
        return *this;
    }
    mint operator-() const { return mint(-x); }
    mint operator+(const mint& p) const { return mint(*this) += p; }
    mint operator-(const mint& p) const { return mint(*this) -= p; }
    mint operator*(const mint& p) const { return mint(*this) *= p; }
    mint operator/(const mint& p) const { return mint(*this) /= p; }
    bool operator==(const mint& p) const { return x == p.x; }
    bool operator!=(const mint& p) const { return x != p.x; }
    mint pow(int64_t n) const {
        mint res = 1, mul = x;
        while(n > 0){
            if(n & 1)   res *= mul;
            mul *= mul;
            n >>= 1;
        }
        return res;
    }
    mint inverse() const { return pow(mod - 2); }
    friend ostream& operator<<(ostream& os, const mint& p){
        return os << p.x;
    }
    friend istream& operator>>(istream& is, mint& p){
        int64_t val;
        is >> val;
        p = mint(val);
        return is;
    }
};

int main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    int N, M, A, B;
    cin >> N >> M;
    vector<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];
    cin >> A >> B;

    constexpr int MAX = 100000;
    vector<mint> prv(MAX + 1), nxt(MAX + 1);
    prv[0] = 1;
    for(int i = 0; i < N; ++i){
        for(int j = 0; j <= MAX; ++j)   nxt[j] = prv[j];
        for(int j = 0; j <= 1000 * i; ++j){
            if(prv[j] != 0) nxt[j + V[i]] += prv[j];
        }
        swap(prv, nxt);
    }

    vector<mint> S(MAX + 2);
    for(int i = 0; i <= MAX; ++i){
        S[i + 1] = S[i] + prv[i];
        prv[i] = 0;
    }

    prv[0] = 1;
    for(int i = 0; i < M; ++i){
        for(int j = 0; j <= MAX; ++j)   nxt[j] = prv[j];
        for(int j = 0; j <= 1000 * i; ++j){
            if(prv[j] != 0) nxt[j + R[i]] += prv[j];
        }
        swap(prv, nxt);
    }

    mint ans = 0;
    for(int r = 1; r <= MAX; ++r){
        if(prv[r] == 0 || (ll)r * A > MAX)  continue;
        int left = r * A, right = min<ll>(MAX + 1, (ll)r * B + 1);
        ans += prv[r] * (S[right] - S[left]);
    }

    cout << ans << endl;

    return 0;
}