#yuki1043
mod=10**9+7
mab=10**5+1

n,m=map(int,input().split())
v=list(map(int,input().split()))
r=list(map(int,input().split()))
a,b=map(int,input().split())

dpv=[[0]*mab for i in range(n+1)]
dpv[0][0]=1
for i in range(n):
 for j in range(mab):
  if j>=v[i]:
   dpv[i+1][j]=(dpv[i][j-v[i]]+dpv[i][j])%mod
  else:
   dpv[i+1][j]=dpv[i][j]

dpr=[[0]*mab for i in range(m+1)]
dpr[0][0]=1
for i in range(m):
 for j in range(mab):
  if j>=r[i]:
   dpr[i+1][j]=(dpr[i][j-r[i]]+dpr[i][j])%mod
  else:
   dpr[i+1][j]=dpr[i][j]
   
sv=[0]*mab
for i in range(mab-1):
 sv[i+1]=(sv[i]+dpv[n][i])%mod

res=0
for i in range(1,mab):
 l=a*i
 r=min(mab-1,b*i+1)
 if l>=mab:
  break
 res=(res+(sv[r]-sv[l])*dpr[m][i])%mod
print(res)