a=int(input())
W=list(map(int,input().split()))
b=int(input())
B=list(map(int,input().split()))

W=[(w,0) for w in W]
B=[(b,1) for b in B]

A=W+B
A.sort()

ANS=1
now0=A[0][0]
now=A[0][1]

for i in range(1,len(A)):
    if A[i][0]!=now0 and A[i][1]!=now:
        ANS+=1
        now^=1
        now0=A[i][0]

print(ANS)