N=int(input())
A=list(map(int,input().split()))
B=list(map(int,input().split()))
D=sorted(map(int,input().split()),reverse=True)

ind=0
inda=0
indb=0
ANS=0

while ind<N:
    #print(ind,inda,indb)
    if A[inda]-A[inda+1]<=B[indb]-B[indb+1]:
        inda+=1

    else:
        indb+=1

    while ind<N and A[inda]+B[indb]<D[ind]:
        ind+=1

    if ind <N and A[inda]+B[indb]>=D[ind]:
        ind+=1
        ANS+=1
    else:
        break

print(ANS)