mod=10**9+7
n,m=map(int,input().split())
arr1=list(map(int,input().split()))
arr2=list(map(int,input().split()))
a,b=map(int,input().split())
dp1=[0]*(1000*n+1)
dp1[0]=1
dp2=[0]*(1000*m+1)
dp2[0]=1
for i in range(n):
    for j in range(1000*n,arr1[i]-1,-1):
        dp1[j]+=dp1[j-arr1[i]]
for i in range(1,1000*n+1):
    dp1[i]+=dp1[i-1]
for i in range(m):
    for j in range(1000*m,arr2[i]-1,-1):
        dp2[j]+=dp2[j-arr2[i]]
ans=0
for i in range(1,1000*m+1):
    ans+=dp2[i]*(dp1[min(b*i,1000*n)]-dp1[min(a*i-1,1000*n)])
    ans%=mod
print(ans)