import sys; input = sys.stdin.buffer.readline
sys.setrecursionlimit(10**7)
from collections import defaultdict
con = 10 ** 9 + 7; INF = float("inf")

def getlist():
	return list(map(int, input().split()))

#処理内容
def main():
	N, M = getlist()
	V = getlist()
	R = getlist()
	A, B = getlist()
	
	DPv = [0] * (10 ** 5 + 1)
	DPv[0] = 1
	for i in range(N):
		for j in range(10 ** 5 + 1, -1, -1):
			if j + V[i] <= 10 ** 5:
				DPv[j + V[i]] += DPv[j]
				DPv[j + V[i]] %= con

	
	DPr = [0] * (10 ** 5 + 1)
	DPr[0] = 1
	for i in range(M):
		for j in range(10 ** 5 + 1, -1, -1):
			if j + R[i] <= 10 ** 5:
				DPr[j + R[i]] += DPr[j]
				DPr[j + R[i]] %= con

	# Vの累積
	for i in range(1, 10 ** 5 + 1):
		DPv[i] = (DPv[i - 1] + DPv[i]) % con

	ans = 0
	for i in range(1, 10 ** 5 + 1):
		ans += DPr[i] * (DPv[min(B * i, 10 ** 5)] - DPv[min(A * i - 1, 10 ** 5)])
		ans %= con

	print(ans)

if __name__ == '__main__':
	main()