import sys
input = sys.stdin.readline

from collections import Counter
from itertools import accumulate

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=1000000007

C=Counter()
C[0]=1
for v in V:
    NC=Counter()
    for c in C:
        NC[c]=(NC[c]+C[c])%mod
        NC[c+v]=(NC[c+v]+C[c])%mod
    C=NC

C2=Counter()
C2[0]=1
for r in R:
    NC2=Counter()
    for c2 in C2:
        NC2[c2]=(NC2[c2]+C2[c2])%mod
        NC2[c2+r]=(NC2[c2+r]+C2[c2])%mod
    C2=NC2

del(C[0])
del(C2[0])

COUNT0=[0]*(10**5+1)
COUNT1=[0]*(10**5+1)

for c in C:
    COUNT0[c]=C[c]
for c2 in C2:
    COUNT1[c2]=C2[c2]

S1=list(accumulate(COUNT1))

ANS=0
r=0
for v in range(1,10**5+1):
    while r*B<v and r<=10**5:
        r+=1

    #print(v,r,ANS)
    if 0<=r-1<=10**5:
        ANS+=COUNT0[v]*(S1[-1]-S1[r-1])
    elif r==10**5+1:
        ANS+=COUNT0[v]*(S1[-1]-S1[10**5])
#print(ANS)

r=0
for v in range(1,10**5+1):
    while r*A<=v and r>=0:
        r+=1
    #print(v,r)
    if r<=10**5:
        ANS-=COUNT0[v]*(S1[-1]-S1[r-1])
    elif r==10**5+1:
        ANS-=COUNT0[v]*(S1[-1]-S1[10**5])
        
    
    
print(ANS%mod)