#region Header
#!/usr/bin/env python3
# from typing import *

import sys
import io
import math
import collections
import decimal
import itertools
from queue import PriorityQueue
import bisect
import heapq

def input():
    return sys.stdin.readline()[:-1]

sys.setrecursionlimit(1000000)
#endregion

# _INPUT = """3 3
# 2 3 4
# 10 23 26
# 1 100
# """
# sys.stdin = io.StringIO(_INPUT)

MOD = 1000000007

def main():
    N, M = map(int, input().split())
    V = list(map(int, input().split()))
    R = list(map(int, input().split()))
    A, B = map(int, input().split())

    SumV = sum(V)
    dpV = [0 for _ in range(SumV+1)]
    dpV[0] = 1
    dpV[V[0]] = 1
    for i in range(0, N-1):
        dpV1 = [0 for _ in range(SumV+1)]
        for v in range(SumV+1):
            if dpV[v] > 0:
                dpV1[v] += dpV[v]
                dpV1[v+V[i+1]] += dpV[v]
        dpV = dpV1

    SumR = sum(R)
    dpR = [0 for _ in range(SumR+1)]
    dpR[0] = 1
    dpR[R[0]] = 1
    for i in range(0, M-1):
        dpR1 = [0 for _ in range(SumR+1)]
        for r in range(SumR+1):
            if dpR[r] > 0:
                dpR1[r] += dpR[r]
                dpR1[r+R[i+1]] += dpR[r]
        dpR = dpR1

    SV = [0 for _ in range(SumV+1)]
    SV[0] = dpV[0]
    for v in range(1, SumV+1):
        SV[v] = SV[v-1] + dpV[v]

    n = 0
    for r in range(1, SumR+1):
        v1 = max(r*A, 1)
        v2 = min(r*B, SumV)
        if v1 <= v2:
            n += dpR[r] * (SV[v2] - SV[v1-1])

    print(n % MOD)


if __name__ == '__main__':
    main()