n,m=map(int,input().split())
v=list(map(int,input().split()))
r=list(map(int,input().split()))
a,b=map(int,input().split())
mod=10**9+7
import collections
V=collections.defaultdict(int)
R=collections.defaultdict(int)
V[0]=1
R[0]=1
for i in v:
    for j,k in list(V.items()):
        V[j+i]+=k
        V[j+i]%=mod
for i in r:
    for j,k in list(R.items()):
        R[j+i]+=k
        R[j+i]%=mod

Vkumi=[0 for i in range(100001)]
del V[0]
del R[0]

for i,j in V.items():
    Vkumi[i]=j
for i in range(1,100001):
    Vkumi[i]+=Vkumi[i-1]
    Vkumi[i]%=mod

ans=0
for i,j in R.items():
    if i*a>10**5:
        continue
    elif i*b>10**5:
        ans+=(Vkumi[-1]-Vkumi[i*a-1])*j%mod
        ans%=mod
    else:
        ans+=(Vkumi[i*b]-Vkumi[i*a-1])*j%mod
        ans%=mod
print(ans)