// I SELL YOU...! 
#include<iostream>
#include<vector>
#include<algorithm>
#include<functional>
#include<queue>
#include<chrono>
#include<iomanip>
#include<map>
#include<set>
using namespace std;
using ll = long long;
using P = pair<ll,ll>;
using TP = tuple<ll,ll,ll>;
void init_io(){
  cin.tie(0);
  ios::sync_with_stdio(false);
  cout << fixed << setprecision(18);
}
#define MOD 1000000007
#define MAX 5050000
ll vsum[MAX][2]={},rsum[MAX][2]={};
void solve_dp(ll dp[MAX][2],vector<ll> &v,ll n){
  dp[0][0] = 1;
  for(int i=0;i<n;i++){
    for(int j=0;j<MAX;j++){
      dp[j][1] = dp[j][0];
      if(j>=v[i]){
        dp[j][1] += dp[j-v[i]][0];
        dp[j][1] %= MOD;
      }
    }
    for(int j=0;j<MAX;j++){
      dp[j][0] = dp[j][1];
    }
  }
}
signed main(){
  init_io();
  ll n,m,a,b,ans=0;
  cin >> n >> m;
  vector<ll> v(n),r(m);
  vector<ll> sum(MAX+1,0);
  for(int i=0;i<n;i++){
    cin >> v[i];
  }
  for(int i=0;i<m;i++){
    cin >> r[i];
  }
  solve_dp(vsum,v,n);
  solve_dp(rsum,r,m);
  for(int i=0;i<MAX;i++){
    sum[i+1] = (sum[i] + vsum[i][0])%MOD;
  }
  cin >> a >> b;
  for(int i=1;i<MAX;i++){
    ll l = a*i,r=i*b;
    if(r>=MAX) break;
    ans = (ans+(sum[r+1]-sum[l])*rsum[i][0]+MOD)%MOD;
  }
  cout << ans << endl;
}