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

S = sum(V)
D = [0]*(S+2)
for e in V:
    for k in range(S+1,-1,-1):
        if D[k] > 0:
            D[k+e] += D[k]
    D[e] += 1

U = sum(R)
T = [0]*(U+2)
for e in R:
    for k in range(U+1,-1,-1):
        if T[k] > 0:
            T[k+e] += T[k]
    T[e] += 1

for k in range(1,S+2):
    D[k] += D[k-1]
ans = 0
for k in range(1,U+1):
    ans += T[k]*(D[min(S,k*B)]-D[max(0,min(S,k*A-1))])
print(ans%MOD)