#include <iostream>
#include <vector>
using namespace std;

constexpr int MOD = 1000000007;
constexpr int HI = 101010;
int main()
{
    int N, M;
    cin >> N >> M;
    vector<int> vp(HI), rp(HI);
    vp[0] = rp[0] = 1;
    while (N--)
    {
        int v;
        cin >> v;
        for (int i = HI - 1; i >= v; i--)
        {
            vp[i] += vp[i - v];
            if (vp[i] >= MOD) vp[i] -= MOD;
        }
    }
    while (M--)
    {
        int r;
        cin >> r;
        for (int i = HI - 1; i >= r; i--)
        {
            rp[i] += rp[i - r];
            if (rp[i] >= MOD) rp[i] -= MOD;
        }
    }

    vp[0] = rp[0] = 0;

    for (int i = 0; i < HI - 1; i++)
    {
        vp[i + 1] += vp[i];
        if (vp[i + 1] >= MOD) vp[i + 1] -= MOD;
    }
    long long a, b;
    cin >> a >> b;
    long long ret = 0;
    for (int i = 1; i < HI - 1; i++)
    {
        if (!rp[i]) continue;
        long long lo = min<long long>(i * a, HI - 1), hi = min<long long>(i * b, HI - 1);
        ret += 1LL * rp[i] * (vp[hi] - vp[lo - 1] + MOD);
        ret %= MOD;
    }
    cout << ret << '\n';
}