import sys
import io, os
input = sys.stdin.buffer.readline

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

M = 10**5+50
SV = [0]*M
SR = [0]*M

SV[0] = 1
for v in V:
    temp = [0]*M
    for i in range(M):
        temp[i] = SV[i]
    for i in range(M):
        if i+v < M:
            temp[i+v] += SV[i]
            temp[i+v] %= mod
    SV = temp
SR[0] = 1
for r in R:
    temp = [0]*M
    for i in range(M):
        temp[i] = SR[i]
    for i in range(M):
        if i+r < M:
            temp[i+r] += SR[i]
            temp[i+r] %= mod
    SR = temp

from itertools import accumulate
cum = SV
cum = list(accumulate(cum))
ans = 0
for i in range(1, M):
    c = SR[i]
    l = a*i
    r = b*i
    ans += (cum[min(r, M-1)]-cum[min(l-1, M-1)])*c
    ans %= mod
print(ans)