#include <bits/stdc++.h>
 
using namespace std;
 
#define DEBUG(x) cerr<<#x<<": "<<x<<endl;
#define DEBUG_VEC(v) cerr<<#v<<":";for(int i=0;i<v.size();i++) cerr<<" "<<v[i]; cerr<<endl;
#define DEBUG_MAT(v) cerr<<#v<<endl;for(int i=0;i<v.size();i++){for(int j=0;j<v[i].size();j++) {cerr<<v[i][j]<<" ";}cerr<<endl;}
typedef long long ll;
// #define int ll
 
#define vi vector<int>
#define vl vector<ll>
#define vii vector< vector<int> >
#define vll vector< vector<ll> >
#define vs vector<string>
#define pii pair<int,int>
#define pis pair<int,string>
#define psi pair<string,int>
#define pll pair<ll,ll>
template<class S, class T> pair<S, T> operator+(const pair<S, T> &s, const pair<S, T> &t) { return pair<S, T>(s.first + t.first, s.second + t.second); }
template<class S, class T> pair<S, T> operator-(const pair<S, T> &s, const pair<S, T> &t) { return pair<S, T>(s.first - t.first, s.second - t.second); }
template<class S, class T> ostream& operator<<(ostream& os, pair<S, T> p) { os << "(" << p.first << ", " << p.second << ")"; return os; }
#define X first
#define Y second
#define rep(i,n) for(int i=0;i<(int)(n);i++)
#define rep1(i,n) for(int i=1;i<=(int)(n);i++)
#define rrep(i,n) for(int i=(int)(n)-1;i>=0;i--)
#define rrep1(i,n) for(int i=(int)(n);i>0;i--)
#define REP(i,a,b) for(int i=a;i<b;i++)
#define in(x, a, b) (a <= x && x < b)
#define all(c) c.begin(),c.end()
template<class T> bool chmax(T &a, const T &b) { if (a<b) { a = b; return 1; } return 0; }
template<class T> bool chmin(T &a, const T &b) { if (a>b) { a = b; return 1; } return 0; }
#define UNIQUE(v) v.erase(std::unique(v.begin(), v.end()), v.end());
const ll inf = 1000000001;
const ll INF = (ll)1e18 + 1;
const long double pi = 3.1415926535897932384626433832795028841971L;
#define Sp(p) cout<<setprecision(25)<< fixed<<p<<endl;
//int dx[4] = {1, 0, -1, 0}, dy[4] = {0, 1, 0, -1};
//int dx2[8] = { 1,1,0,-1,-1,-1,0,1 }, dy2[8] = { 0,1,1,1,0,-1,-1,-1 };
vi dx = {1, 0, -1, 0}, dy = {0, 1, 0, -1};
vi dx2 = { 1,1,0,-1,-1,-1,0,1 }, dy2 = { 0,1,1,1,0,-1,-1,-1 };
#define fio() cin.tie(0); ios::sync_with_stdio(false);
const ll MOD = 1000000007;
//const ll MOD = 998244353;
// #define mp make_pair
//#define endl '\n'


vl fill_dp(vi r) {
    int n = r.size();
    int m = n * 1000 + 1;
    vll dp(n + 1, vl(m));
    dp[0][0] = 1;
    rep (i, n) {
        rep (j, m) {
            if (dp[i][j] == 0) continue;
            (dp[i + 1][j] += dp[i][j]) %= MOD;
            (dp[i + 1][j + r[i]] += dp[i][j]) %= MOD;
        }
    }
    return dp[n];
}

signed main() {
    int n, m;
    cin >> n >> m;

    vi v(n), r(m);
    rep (i, n) cin >> v[i];
    rep (j, m) cin >> r[j];

    vl a = fill_dp(v), b = fill_dp(r);

    // DEBUG_VEC(a);
    // DEBUG_VEC(b);

    vl sum(a.size() + 1);
    rep (i, a.size()) {
        sum[i + 1] = sum[i] + a[i];
        sum[i + 1] %= MOD;
    }
    ll A, B;
    cin >> A >> B;

    // DEBUG_VEC(sum);

    ll ans = 0;
    for (int i = 1; i < b.size(); i++) {
        if (b[i] == 0) continue;
        int x = i;
        if (A * x > a.size()) continue;
        ans += (sum[min(B * x + 1, (ll)a.size())] - sum[A * x]) * b[i] % MOD;
    }
    ans = (ans % MOD + MOD) % MOD;
    cout << ans << endl;
}