N,M = map(int,input().split())
lsV = list(map(int,input().split()))
lsR = list(map(int,input().split()))
A,B = map(int,input().split())
mod = 10**9+7
dpV = [0]*(10**5+2)
dpV[0] = 1
for j in range(N):
    dpV2 = dpV[:]
    for i in range(10**5+1):    
        if i + lsV[j] <= 10**5:
            dpV2[i + lsV[j]] += dpV[i]
            dpV2[i + lsV[j]] %= mod
    dpV = dpV2

dpR = [0]*(10**5+1)
dpR[0] = 1
for j in range(M):
    dpR2 = dpR[:]
    for i in range(10**5+1):    
        if i + lsR[j] <= 10**5:
            dpR2[i + lsR[j]] += dpR[i]
            dpR2[i + lsR[j]] %= mod
    dpR = dpR2


for i in range(1,10**5+2):
    dpV[i] += dpV[i-1]
    dpV[i] %= mod
ans = 0
for j in range(1,10**5+1):
    ans += dpR[j]*(dpV[min(10**5+1,B*j)]-dpV[min(10**5+1,A*j-1)])
    ans %= mod
print(ans)