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

sum_v = sum(v)
dv = [0] * (sum_v + 1)
dv[0] = 1
for i in range(n):
    val = v[i]
    for w in range(sum_v + 1)[::-1]:
        if w - val >= 0:
            dv[w] += dv[w - val]
            dv[w] %= MOD
            
sum_r = sum(r)
dr = [0] * (sum_r + 1)
dr[0] = 1
for i in range(m):
    val = r[i]
    for w in range(sum_r + 1)[::-1]:
        if w - val >= 0:
            dr[w] += dr[w - val]
            dr[w] %= MOD

ru_v = [0] * (sum_v + 2)
for i in range(sum_v + 1):
    ru_v[i + 1] = ru_v[i] + dv[i]
    ru_v[i + 1] %= MOD

# A
ptn_a = 0
for i in range(1, sum_r + 1):
    val = i * a
    # ptn_a += sum(dv[1:val]) * dr[i]
    ptn_a += (ru_v[min(val, sum_v + 1)] - ru_v[1]) * dr[i]
    ptn_a %= MOD
# B
ptn_b = 0
for i in range(1, sum_r + 1):
    val = i * b
    # ptn_b += sum(dv[1:val + 1]) * dr[i]
    ptn_b += (ru_v[min(val + 1, sum_v + 1)] - ru_v[1]) * dr[i]
    ptn_b %= MOD

print((ptn_b - ptn_a) % MOD)