#include<bits/stdc++.h>

#define rep(i,n) for(int i=0;i<n;i++)
#define MOD 1000000007
#define MAX_VR 1000
#define ll long long int
using namespace std;
int main()
{
	int N,M;
	cin>>N>>M;
	vector<int> V(N);
	vector<int> R(M);
	sort(V.begin(),V.end());
	sort(R.begin(),R.end());
	rep(i,N) cin>>V[i];
	rep(i,M) cin>>R[i];
	int A,B;
	cin>>A>>B;
	vector<vector<ll>> dp_v(N+1,vector<ll>(N*MAX_VR+1,0));
	vector<vector<ll>> dp_r(M+1,vector<ll>(M*MAX_VR+1,0));
	dp_v[0][0]=1;
	dp_r[0][0]=1;
	rep(i,N)
	{
		for(int j=N*MAX_VR-V[i];j>=0;j--)
		{
			dp_v[i+1][j]+=dp_v[i][j];
			dp_v[i+1][j+V[i]]+=dp_v[i][j];
			dp_v[i+1][j]%=MOD;
		}
	}
	rep(i,M)
	{
		for(int j=M*MAX_VR-R[i];j>=0;j--)
		{
			dp_r[i+1][j]+=dp_r[i][j];
			dp_r[i+1][j+R[i]]+=dp_r[i][j];
			dp_r[i+1][j]%=MOD;
		}
	}
	vector<ll> alloc(N*MAX_VR+2,0);
	rep(i,N*MAX_VR+1)
	{
		alloc[i+1]=alloc[i]+dp_v[N][i];
	}
	ll ans=0;
	for(int i=1;i<=M*MAX_VR;i++)
	{
		int max=B*i;
		int min=A*i;
		if(min>N*MAX_VR)break;
		if(max>N*MAX_VR)max=N*MAX_VR;
		ans+=(alloc[max+1]-alloc[min])*dp_r[M][i];
		ans%=MOD;
	}
	cout<<ans<<endl;
	return 0;
}