n,m=[int(j)for j in input().split()]
v=[int(j)for j in input().split()]
r=[int(j)for j in input().split()]
a,b=[int(j)for j in input().split()]
mod=10**9+7
import numpy as np
lv=np.zeros(10**5+1,dtype=np.int64)
lr=np.zeros(10**5+1,dtype=np.int64)
lv[0]=1
lr[0]=1
for i in v:
    lv[i:]+=lv[:-i]
    lv%=mod
for i in r:
    lr[i:]+=lr[:-i]
    lr%=mod
v_sum=[0]*(10**5+1)
for i in range(10**5):
    v_sum[i+1]=(v_sum[i]+lv[i])%mod

lv%=mod
lv[0]=0
ans=0
for i in np.where(lr[1:]>0)[0]:
    i=i+1
    if a*i>10**5:
        break
    ans=(ans+lr[i]*(v_sum[min(10**5,b*i+1)]-v_sum[a*i]))%mod

print(ans)