N,M=map(int,input().split())

V=list(map(int,input().split()))
R=list(map(int,input().split()))

A,B=map(int,input().split())
    
dp_V=[0]*(10**5+1)
dp_V[0]=1

for v in V:
    for i in range(len(dp_V))[::-1]:
            if dp_V[i]!=0:
                dp_V[i+v]+=dp_V[i]

dp_R=[0]*(10**5+1)
dp_R[0]=1

for r in R:
    for i in range(len(dp_R))[::-1]:
            if dp_R[i]!=0:
                dp_R[i+r]+=dp_R[i]

col_R=[0]*(10**5+1)
col_R[0]=0
for i in range(1,len(dp_R)):
    col_R[i]=col_R[i-1]+dp_R[i]
#print(dp_V)
#print(col_R)

ans=0
for i in range(1,len(dp_V)):
    low=-(-i//B)
    high=i//A
    ans+=(col_R[high]-col_R[low-1])*dp_V[i]
print(ans%(10**9+7))