#include <algorithm>
#include <cmath>
#include <cstdint>
#include <cstdio>
#include <iomanip>
#include <iostream>
#include <map>
#include <queue>
#include <set>
#include <stack>
#include <string>
#include <vector>
using namespace std;
#define rep(i, n) for(int(i) = 0; (i) < (n); (i)++)
#define FOR(i, m, n) for(int(i) = (m); (i) < (n); (i)++)
#define All(v) (v).begin(), (v).end()
#define pb push_back
#define MP(a, b) make_pair((a), (b))
template <class T> vector<T> make_vec(size_t a, T val) {
    return vector<T>(a, val);
}
template <class T, class... Ts> auto make_vec(size_t a, Ts... ts) {
    return vector<decltype(make_vec<T>(ts...))>(a, make_vec<T>(ts...));
}
using ll = long long;
using pii = pair<int, int>;
using pll = pair<ll, ll>;
const int INF = 1 << 30;
const ll LINF = 1LL << 60;
const int MOD = 1e9 + 7;

template <uint_fast64_t MOD> class ModInt {
    using u64 = uint_fast64_t;

  public:
    u64 val;

    ModInt(const u64 x = 0) : val((x + MOD) % MOD) {}
    constexpr u64 &value() { return val; }
    constexpr ModInt operator-() { return val ? MOD - val : 0; }
    constexpr ModInt operator+(const ModInt &rhs) const {
        return ModInt(*this) += rhs;
    }
    constexpr ModInt operator-(const ModInt &rhs) const {
        return ModInt(*this) -= rhs;
    }
    constexpr ModInt operator*(const ModInt &rhs) const {
        return ModInt(*this) *= rhs;
    }
    constexpr ModInt operator/(const ModInt &rhs) const {
        return ModInt(*this) /= rhs;
    }
    constexpr ModInt &operator+=(const ModInt &rhs) {
        val += rhs.val;
        if(val >= MOD) {
            val -= MOD;
        }
        return *this;
    }
    constexpr ModInt &operator-=(const ModInt &rhs) {
        if(val < rhs.val) {
            val += MOD;
        }
        val -= rhs.val;
        return *this;
    }
    constexpr ModInt &operator*=(const ModInt &rhs) {
        val = val * rhs.val % MOD;
        return *this;
    }

    constexpr ModInt &operator/=(const ModInt &rhs) {
        *this *= rhs.inv();
        return *this;
    }

    constexpr bool operator==(const ModInt &rhs) {
        return this->val == rhs.val;
    }
    constexpr bool operator!=(const ModInt &rhs) {
        return this->val != rhs.val;
    }
    friend constexpr ostream &operator<<(ostream &os, const ModInt<MOD> &x) {
        return os << x.val;
    }
    friend constexpr istream &operator>>(istream &is, ModInt<MOD> &x) {
        return is >> x.val;
    }

    constexpr ModInt inv() const { return ModInt(*this).pow(MOD - 2); }

    constexpr ModInt pow(ll e) const {
        u64 x = 1, p = val;
        while(e > 0) {
            if(e % 2 == 0) {
                p = (p * p) % MOD;
                e /= 2;
            } else {
                x = (x * p) % MOD;
                e--;
            }
        }
        return ModInt(x);
    }
};

using mint = ModInt<MOD>;

int main() {
    ll N, M;
    cin >> N >> M;
    vector<ll> V(N), R(M);
    rep(i, N) cin >> V[i];
    rep(i, M) cin >> R[i];
    ll A, B;
    cin >> A >> B;
    auto vdp = make_vec(100001, mint(0)), rdp = make_vec(100001, mint(0));
    vdp[0] = 1, rdp[0] = 1;
    for(int i = 0; i < N; i++) {
        auto next = make_vec(100001, mint(0));
        for(int j = 0; j < 100001; j++) {
            if(vdp[j] != 0) {
                next[j] += vdp[j];
                next[j + V[i]] += vdp[j];
            }
        }
        swap(vdp, next);
    }
    for(int i = 0; i < M; i++) {
        auto next = make_vec(100001, mint(0));
        for(int j = 0; j < 100001; j++) {
            if(rdp[j] != 0) {
                next[j] += rdp[j];
                next[j + R[i]] += rdp[j];
            }
        }
        swap(rdp, next);
    }
    auto vsum = make_vec(100002, mint(0));
    rep(i, 100001) { vsum[i + 1] = vsum[i] + vdp[i]; }
    mint res = 0;
    for(int i = 1; i <= 100000; i++) {
        if(rdp[i] != 0) {
            int left = min(100000LL, i * A);
            int right = min(100000LL, i * B);
            res += (vsum[right + 1] - vsum[left]) * rdp[i];
        }
    }
    cout << res << endl;
    return 0;
}