n, m = map(int, input().split())
v = list(map(int, input().split()))
r = list(map(int, input().split()))
a, b = map(int, input().split())

MAX = 100010
mod = 10**9 + 7
dpv = [[0 for j in range(MAX)] for i in range(n+1)]
dpr = [[0 for j in range(MAX)] for i in range(m+1)]
dpv[0][0] = 1
for i in range(n):
    for j in range(MAX):
        if dpv[i][j] > 0:
            dpv[i+1][j] += dpv[i][j]
            dpv[i+1][j] %= mod
            if j + v[i] < MAX:
                dpv[i+1][j+v[i]] += dpv[i][j]
                dpv[i+1][j+v[i]] %= mod       
dpr[0][0] = 1
for i in range(m):
    for j in range(MAX):
        if dpr[i][j] > 0:
            dpr[i+1][j] += dpr[i][j]
            dpr[i+1][j] %= mod
            if j + r[i] < MAX:
                dpr[i+1][j+r[i]] += dpr[i][j]
                dpr[i+1][j+r[i]] %= mod
                
vsum = [0 for _ in range(MAX)]
for i in range(MAX-1):
    vsum[i+1] = vsum[i] + dpv[n][i]
    vsum[i+1] %= mod
    
ans = 0
for i in range(1, MAX):
    L, R = a*i, min(MAX-1, b*i+1)
    if L >= MAX:
        break
    ans += (vsum[R] - vsum[L] + mod) % mod * dpr[m][i] % mod
    ans %= mod
print(ans)