import sys
input = sys.stdin.readline

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=1000000007

from collections import Counter
C=Counter()
C[0]=1
for v in V:
    NC=Counter()
    for c in C:
        NC[c]=(NC[c]+C[c])%mod
        NC[c+v]=(NC[c+v]+C[c])%mod
    C=NC

C2=Counter()
C2[0]=1
for r in R:
    NC2=Counter()
    for c2 in C2:
        NC2[c2]=(NC2[c2]+C2[c2])%mod
        NC2[c2+r]=(NC2[c2+r]+C2[c2])%mod
    C2=NC2

del(C[0])
del(C2[0])

ANS=0
for c in C:
    for c2 in C2:
        if A*c2<=c<=B*c2:
            ANS=(ANS+C[c]*C2[c2])%mod
print(ANS)