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

    vt = {}
    vt[0] = 1
    for v in V:
        nvt = vt.copy()
        for k in vt:
            nvt.setdefault(k + v, 0)
            nvt[k + v] += vt[k]
        vt = nvt
    del vt[0]

    rt = {}
    rt[0] = 1
    for r in R:
        nrt = rt.copy()
        for k in rt:
            nrt.setdefault(k + r, 0)
            nrt[k + r] += rt[k]
        rt = nrt
    del rt[0]

    ma = (max(vt) // A + 1, max(rt) + 1)
    ra = [0] * ma
    for k in rt:
        ra[k] = rt[k]

    for i in range(1, ma):
        ra[i] += ra[i - 1]

    result = 0
    for k in vt:
        rlow = (k + B - 1) // B - 1
        rhigh = k // A
        if rlow == -1:
            result += ra[rhigh] * vt[k]
        else:
            result += (ra[rhigh] - ra[rlow]) * vt[k]
        result %= 1000000007
    print(result)


main()