local mod = 1000000007
local mfl = math.floor
local mmi, mma = math.min, math.max

local function bmul(x, y)
  local x1, y1 = mfl(x / 31623), mfl(y / 31623)
  local x0, y0 = x - x1 * 31623, y - y1 * 31623
  return (x1 * y1 * 14122 + (x1 * y0 + x0 * y1) * 31623 + x0 * y0) % mod
end

local function badd(x, y)
  return (x + y) % mod
end
local function bsub(x, y)
  return x < y and x - y + mod or x - y
end
local n, m = io.read("*n", "*n")
local v, r = {}, {}
for i = 1, n do
  v[i] = io.read("*n")
end
for i = 1, m do
  r[i] = io.read("*n")
end
local a, b = io.read("*n", "*n")
local vdp, rdp = {}, {}
local lim = 100000
for i = 1, lim do
  vdp[i], rdp[i] = 0, 0
end
for i = 1, n do
  local vi = v[i]
  for j = lim - vi, 1, -1 do
    vdp[j + vi] = badd(vdp[j + vi], vdp[j])
  end
  vdp[vi] = badd(vdp[vi], 1)
end

for i = 1, m do
  local ri = r[i]
  for j = lim - ri, 1, -1 do
    rdp[j + ri] = badd(rdp[j + ri], rdp[j])
  end
  rdp[ri] = badd(rdp[ri], 1)
end

local vsum = {}
vsum[1] = vdp[1]
for i = 2, lim do
  vsum[i] = badd(vsum[i - 1], vdp[i])
end
local ret = 0
for ir = 1, lim do
  local rr = rdp[ir]
  local vmin = ir * a
  local vmax = mmi(lim, ir * b)
  if vmin <= vmax then
    local z = vsum[vmax]
    if 1 < vmin then
      z = bsub(z, vsum[vmin - 1])
    end
    ret = badd(ret, bmul(z, rr))
  end
end
print(ret)