typedef long long ll;
typedef long double ld;
#include <bits/stdc++.h>
using namespace std;
ll const MOD = 1e9+7;
int main() {
    ll n,m;
    std::cin >> n>>m;
    
    vector<ll> v(n),r(m);
    for (int i = 0; i < n; i++) {
        std::cin >> v[i];
    }
    for (int i = 0; i < m; i++) {
        std::cin >> r[i];
    }
    
    ll a,b;
    std::cin >> a>>b;
    
    vector<vector<ll>> dpv(n+1,vector<ll>(100010,0));
    vector<vector<ll>> dpr(m+1,vector<ll>(100010,0));
    dpv[0][0]++;
    dpr[0][0]++;
    
    for (int i = 0; i < n; i++) {
        for (int j = 0; j <= 100000; j++) {
            dpv[i+1][j] = dpv[i][j];
            if(j-v[i]>=0) dpv[i+1][j] += dpv[i][j-v[i]];
            dpv[i+1][j] %= MOD;
        }
    }
    for (int i = 0; i < m; i++) {
        for (int j = 0; j <= 100000; j++) {
            dpr[i+1][j] = dpr[i][j];
            if(j-r[i]>=0) dpr[i+1][j] += dpr[i][j-r[i]];
            dpr[i+1][j] %= MOD;
        }
    }

    vector<ll> rui(100010,0);
    
    for (int i = 1; i <= 100000; i++) {
        rui[i+1] = rui[i] + dpr[m][i];
        rui[i+1] %= MOD;
    }
    ll ans = 0;
    for (int i = 1; i <= 100000; i++) {
        ans += dpv[n][i]*(rui[i/a+1]+MOD-rui[(i+b-1)/b])%MOD;
        ans %= MOD;
    }
    
    std::cout << ans << std::endl;}