N, M = map(int, input().split())
X = list(map(int, input().split()))
Y = list(map(int, input().split()))
A, B = map(int, input().split())
sx = sum(X)+1
sy = sum(Y)+1
V = [0]*sx
V[0] = 1
for i in range(N):
    x = X[i]
    for j in range(sx-1, -1, -1):
        if j-x>=0:
            V[j] += V[j-x]
R = [0]*sy
R[0] = 1
for i in range(M):
    x = Y[i]
    for j in range(sy-1, -1, -1):
        if j-x>=0:
            R[j] += R[j-x]

SV = [0]*(sx+1)
for i in range(1, sx+1):
    SV[i] = SV[i-1] + V[i-1]

mod = 1000000007
rr = 0
for i in range(1, sy):
    r = R[i]
    a, b = min(i*A, sx), min(i*B+1, sx)
    rr = (rr+(SV[b]-SV[a])*r) % mod
#print(SV)
#print(V, R)
print(rr)