#include <bits/stdc++.h>
using namespace std;
using ll = long long;
constexpr ll mod = 1e9 + 7;
constexpr ll INF = 1LL << 60;

#define REP(i, init, n) for(int i = (int)(init); i < (int)(n); i++)

#define vi vector<int>
#define vl vector<long>
#define vvi vector<vector<int>>
#define vvl vector<vector<long>>
#define pint pair<int, int>
#define plong pair<long, long>

int main() {
    int N, M, A, B;
    cin>> N >> M;
    vi V(N + 1, 0), R(M + 1, 0);
    REP(i, 1, N + 1) cin >> V[i];
    REP(i, 1, M + 1) cin >> R[i];
    cin >> A >> B;
    vvl DPV(N + 1, vl(100010, 0));
    vvl DPR(M + 1, vl(100010, 0));
    REP(i, 0, N + 1) DPV[i][0] = 1;
    REP(i, 0, M + 1) DPR[i][0] = 1;
    
    REP(j, 1, N + 1){
        REP(i, 1, 100001){
            if(i - V[j] >= 0) DPV[j][i] += DPV[j - 1][i - V[j]];
            DPV[j][i] += DPV[j - 1][i];
            DPV[j][i] %= mod;
        }
    } 
    REP(j, 1, M + 1){
        REP(i, 1, 100001){
            if(i - R[j] >= 0) DPR[j][i] += DPR[j - 1][i - R[j]];
            DPR[j][i] += DPR[j - 1][i];
            DPR[j][i] %= mod;
        }
    }
    vl sum(100010, 0);
    long long ans = 0;
    REP(i, 1, 100001){
        sum[i] = DPV[N][i] + sum[i - 1];
        sum[i] %= mod;
        //if(i < 20) cout << sum[i] << " ";
    }
    REP(i, 1, 100001){
        if(i * A - 1 > 100000) break;
        ans += (long)DPR[M][i] * (((i * B < 100000) ? sum[i * B] : sum[100000]) - sum[i * A - 1]) + (long)mod;
        ans %= mod;
    }
    cout << ans << endl;
}