#include <bits/stdc++.h>
using namespace std;
typedef signed long long ll;

#undef _P
#define _P(...) (void)printf(__VA_ARGS__)
#define FOR(x,to) for(x=0;x<(to);x++)
#define FORR(x,arr) for(auto& x:arr)
#define ITR(x,c) for(__typeof(c.begin()) x=c.begin();x!=c.end();x++)
#define ALL(a) (a.begin()),(a.end())
#define ZERO(a) memset(a,0,sizeof(a))
#define MINUS(a) memset(a,0xff,sizeof(a))
//-------------------------------------------------------

int N,M;
int V,R;
ll A,B;
ll SV[101010];
ll SR[101010];
ll mo=1000000007;


void solve() {
	int i,j,k,l,r,x,y; string s;
	
	cin>>N>>M;
	SV[0]=SR[0]=1;
	FOR(i,N) {
		cin>>V;
		for(x=100000;x>=V;x--) (SV[x]+=SV[x-V])%=mo;
	}
	
	for(i=1;i<=100000;i++) (SV[i]+=SV[i-1])%=mo;
	
	FOR(i,M) {
		cin>>R;
		for(x=100000;x>=R;x--) (SR[x]+=SR[x-R])%=mo;
	}
	cin>>A>>B;
	ll ret=0;
	for(i=1;i<=100000;i++) if(SR[i]) {
		ll a=A*i;
		ll b=min(100000LL,B*i);
		if(a<=b) {
			(ret+=SR[i]*(SV[b]-SV[a-1]))%=mo;
		}
	}
	
	cout<<(ret%mo+mo)%mo<<endl;
	
}


int main(int argc,char** argv){
	string s;int i;
	if(argc==1) ios::sync_with_stdio(false), cin.tie(0);
	FOR(i,argc-1) s+=argv[i+1],s+='\n'; FOR(i,s.size()) ungetc(s[s.size()-1-i],stdin);
	cout.tie(0); solve(); return 0;
}