#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i=0; i<n; i++)
#define pb push_back
#define int long long
const int MOD = 1000000007;

int N, M;
int V[110];
int R[110];
int A, B;
int dp1[110][100001];
int dp2[110][100001];

signed main() {
    cin >> N >> M;
    rep(i, N) cin >> V[i];
    rep(i, M) cin >> R[i];
    cin >> A >> B;
    
    rep(i, N+1) rep(j, 100001) dp1[i][j] = 0;
    dp1[0][0] = 1;
    rep(i, N) {
        rep(j, 100001) {
            dp1[i+1][j] += dp1[i][j];
            dp1[i+1][j] %= MOD;
            if (j+V[i]<100001) {
                dp1[i+1][j+V[i]] += dp1[i][j];
                dp1[i+1][j+V[i]] %= MOD;
            }
        }
    }
    
    int acc[100002];
    acc[0] = 0;
    rep(i, 100001) acc[i+1] = acc[i]+dp1[N][i];
    
    rep(i, M+1) rep(j, 100001) dp2[i][j] = 0;
    dp2[0][0] = 1;
    rep(i, M) {
        rep(j, 100001) {
            dp2[i+1][j] += dp2[i][j];
            dp2[i+1][j] %= MOD;
            if (j+R[i]<100001) {
                dp2[i+1][j+R[i]] += dp2[i][j];
                dp2[i+1][j+R[i]] %= MOD;
            }
        }
    }
    
    int ans = 0;
    for (int i=1; i<100001; i++) {
        if (i*A<=100000 && i*B<=100000) {
            ans += dp2[M][i]*(acc[i*B+1]-acc[i*A]);
            ans %= MOD;
        }
    }
    
    cout << ans << endl;
}