#include <iostream>
#include <vector>
#include <algorithm>
#include <cmath>
#include <string>
#include <queue>
#include <stack>
#include <set>
#include <map>
#include <iomanip>
#include <utility>
#include <tuple>
#include <functional>
#include <bitset>
#include <cassert>
#include <complex>
#include <stdio.h>
#include <time.h>
#include <numeric>
#include <random>
#include <unordered_map>
#include <unordered_set>
#define all(a) a.begin(),a.end()
#define rep(i, n) for (ll i = 0; i < (n); i++)
#define pb push_back
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef pair<ll, ll> P;
typedef complex<ld> com;
constexpr int inf = 1000000010;
constexpr ll INF = 1000000000000000010;
constexpr ld EPS = 1e-12;
constexpr ld PI = 3.141592653589793238;
template<class T, class U> inline bool chmax(T &a, const U &b) { if (a < b) { a = b; return true; } return false; }
template<class T, class U> inline bool chmin(T &a, const U &b) { if (a > b) { a = b; return true; } return false; }

constexpr ll mod = 1000000007;

signed main() {
	cin.tie(0);
	ios::sync_with_stdio(false);
	cout << fixed << setprecision(20);

	int n, m;
	cin >> n >> m;
	vector<int> v(n), r(m);
	rep(i, n) cin >> v[i];
	rep(i, m) cin >> r[i];
	ll a, b;
	cin >> a >> b;
	vector<vector<ll>> dpv(101, vector<ll>(100010));
	vector<vector<ll>> dpr(101, vector<ll>(100010));
	dpv[0][0] = dpr[0][0] = 1;
	rep(i, n) {
		rep(j, 100009) {
			dpv[i + 1][j] = dpv[i][j];
			if (j >= v[i]) {
				dpv[i + 1][j] += dpv[i][j - v[i]];
				if (dpv[i + 1][j] >= mod) dpv[i + 1][j] -= mod;
			}
		}
	}
	rep(i, m) {
		rep(j, 100009) {
			dpr[i + 1][j] = dpr[i][j];
			if (j >= r[i]) {
				dpr[i + 1][j] += dpr[i][j - r[i]];
				if (dpr[i + 1][j] >= mod) dpr[i + 1][j] -= mod;
			}
		}
	}
	ll ans = 0;
	vector<ll> vsum(100010);
	rep(i, 100009) {
		vsum[i + 1] = vsum[i] + dpv[n][i + 1];
		if (vsum[i + 1] >= mod) vsum[i + 1] -= mod;
	}
	rep(i, 100010) {
		if (i == 0) continue;
		ll c = vsum[min(100009LL, i*b)] - vsum[min(100009LL, i*a - 1)];
		if (c < 0) c += mod;
		c *= dpr[m][i]; c %= mod;
		ans += c;
		if (ans >= mod) ans -= mod;
	}
	cout << ans << '\n';
}