import strutils, sequtils, math
let get = iterator:string =
    for s in stdin.readAll.split: yield s
proc read:int = get().parseInt
template mo(a) = a = a mod (10^9+7)

let n, m = read()
let v = newSeqWith(n, read())
let r = newSeqWith(m, read())
let a, b = read()

var vc, rc = 0.repeat(10^5 + 1)

vc[0] = 1
for v in v:
    for i in countdown(10^5 - v, 0):
        vc[i+v].inc vc[i]; vc[i+v].mo
vc[0] = 0

rc[0] = 1
for r in r:
    for i in countdown(10^5 - r, 0):
        rc[i+r].inc rc[i]; rc[i+r].mo
rc[0] = 0
for i in 1..10^5: rc[i].inc rc[i-1]; rc[i].mo

var cnt = 0
for v, c in vc:
    let rma = v div a
    let rmi = (v + b - 1) div b
    cnt.inc (rc[rma] - rc[max(0, rmi-1)]) * c
    cnt.mo

echo cnt