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

dp = [[0]*(10**5+1) for _ in range(N)]
dp1 = [[0]*(10**5+1) for _ in range(M)]
dp[0][0] = 1;dp[0][V[0]] = 1
dp1[0][0] = 1;dp1[0][R[0]] = 1
for i in range(1, N):
    for j in range(10**5+1):
        dp[i][j] += dp[i-1][j] 
        if dp[i-1][j] > 0:
            dp[i][j+V[i]] += dp[i-1][j]
for i in range(1, M):
    for j in range(10**5+1):
        dp1[i][j] += dp1[i-1][j] 
        if dp1[i-1][j] > 0:
            dp1[i][j+R[i]] += dp1[i-1][j]
from itertools import accumulate
VV = list(accumulate(dp[-1]))
res = 0
mod = 10**9+7
for i in range(1,len(dp1[-1])):
    if dp1[-1][i] > 0 and A*dp1[-1][i]<=10**5:
        res += (VV[min(10**5, B*i)] - VV[A*i-1])*dp1[-1][i]
        res %= mod
print(res)