import collections
import itertools

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
DPV = collections.defaultdict(int)
DPR = collections.defaultdict(int)
DPV[0]=1
DPR[0]=1
for a in V:
    NDPV = collections.defaultdict(int)
    for k,v in DPV.items():
        NDPV[k+a]=(v+NDPV[k+a])%mod
        NDPV[k]=(v+NDPV[k])%mod
    DPV = NDPV

for a in R:
    NDPR = collections.defaultdict(int)
    for k,v in DPR.items():
        NDPR[k+a]=(v+NDPR[k+a])%mod
        NDPR[k]=(v+NDPR[k])%mod
    DPR = NDPR
RS = [0]*1000*(M+1)
for k,v in DPR.items():
    RS[k]=v

RAC = list(itertools.accumulate(RS))

ans = 0
for k,v in DPV.items():
    if k>0:
        ma = k//A
        mi = -(-k//B)
        ans = (ans+(RAC[min(ma,len(RAC)-1)]-RAC[min(mi-1,len(RAC)-1)])*v)%mod
print(ans)