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 = [0] * (10**5+1)
dpv[0] = 1
for i in range(N):
    for j in range(10**5, -1, -1):
        if V[i] + j <= 10**5 and dpv[j] > 0:
            dpv[V[i]+j] += dpv[j]
            

dpr = [0] * (10**5+1)
dpr[0] = 1
for i in range(M):
    for j in range(10**5, -1, -1):
        if R[i] + j <= 10**5 and dpr[j] > 0:
            dpr[R[i]+j] += dpr[j]
            

accv = [0]
for i in range(10**5):
    accv.append(accv[i] + dpv[i+1])
    
ans = 0
for i in range(1, len(dpr)):
    if dpr[i] == 0:
        continue
    low = A * i - 1
    hig = B * i 
    num = (accv[hig] - accv[low]) * dpr[i]
    ans += (num % MOD)
    ans %= MOD

print(ans)