N, M = map(int, input().split())
V = list(map(int, input().split()))
R = list(map(int, input().split()))
A, B = map(int, input().split())

ans = 0

dpr = [0 for i in range(10 ** 5 + 1)]
dpv = [0 for i in range(10 ** 5 + 1)]
dpr[0] = 1
dpv[0] = 1

for i in range(M):
    for j in range(10 ** 3 * i, -1, -1):
        if dpr[j]:
            dpr[j + R[i]] += dpr[j]

for i in range(N):
    for j in range(10 ** 3 * i, -1, -1):
        if dpv[j]:
            dpv[j + V[i]] += dpv[j]

dpv[0] = 0
S = [0 for i in range(10 ** 5 + 1)]

for i in range(1, 10 ** 5 + 1):
    S[i] += S[i - 1] + dpv[i]

for i in range(1, 10 ** 5 + 1):
    if not dpr[i]:
        continue
    ans += (S[min(B * i, 10 ** 5)] - S[min(A * i - 1, 10 ** 5)]) * dpr[i]
    ans %= 10 ** 9 + 7

print(ans)