import sys
input = sys.stdin.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())
dp1 = [[0]*(10**5+1) for _ in range(N+1)]
dp2 = [[0]*(10**5+1) for _ in range(M+1)]
dp1[0][0] = 1
dp2[0][0] = 1
MOD = 10**9+7

for i in range(N):
    for j in range(10**5+1):
        dp1[i+1][j] += dp1[i][j]
        dp1[i+1][j] %= MOD
        
        if j+V[i]<=10**5:
            dp1[i+1][j+V[i]] += dp1[i][j]
            dp1[i+1][j+V[i]] %= MOD

acc = [0]

for i in range(10**5+1):
    acc.append(acc[-1]+dp1[N][i])
    
for i in range(N):
    for j in range(10**5+1):
        dp2[i+1][j] += dp2[i][j]
        dp2[i+1][j] %= MOD
        
        if j+R[i]<=10**5:
            dp2[i+1][j+R[i]] += dp2[i][j]
            dp2[i+1][j+R[i]] %= MOD
    
ans = 0

for i in range(1, 10**5+1):
    if i*A<=10**5:
        ans += dp2[M][i]*(acc[min(10**5, i*B)+1]-acc[i*A])
        ans %= MOD

print(ans)