n,m=map(int,input().split())
*v,=map(int,input().split())
*r,=map(int,input().split())
sr=sum(r)
sv=sum(v)

a,b=map(int,input().split())
mod=10**9+7
dpv=[[0]*(100*1000+1) for _ in range(n+1)]
dpv[0][0]=1
dpr=[[0]*(100*1000+1) for _ in range(m+1)]
dpr[0][0]=1

for i in range(1,n+1):
    dpv[i][0]=1
    for j in range(100*1000+1):
        dpv[i][j]=dpv[i-1][j]
        if 0<=j-v[i-1]<=100*1000:
            dpv[i][j]+=dpv[i-1][j-v[i-1]]
        dpv[i][j]%=mod

for i in range(1,m+1):
    dpr[i][0]=1
    for j in range(100*1000+1):
        dpr[i][j]=dpr[i-1][j]
        if 0<=j-r[i-1]<=100*1000:
            dpr[i][j]+=dpr[i-1][j-r[i-1]]
        dpr[i][j]%=mod

dpv=dpv[-1]
dpv[0]=0
from itertools import accumulate
dpvacc=list(accumulate(dpv))
dpr=dpr[-1]
ans=0
for R in range(1, 100*1000+1):
    ans+=(dpr[R]*(dpvacc[min(100*1000,b*R)]-dpvacc[min(a*R,100*1000)-1]))%mod
    ans%=mod

print(ans)