import sys
input=lambda: sys.stdin.readline().rstrip()
nw=int(input())
W=[int(i) for i in input().split()]
nb=int(input())
B=[int(i) for i in input().split()]
W.sort(reverse=True)
B.sort(reverse=True)

sign=1
A=[W[0]]
while True:
  cur=A[-1]
  if sign==0:
    S=W
    sign=1
  else:
    S=B
    sign=0
  for i in range(len(S)):
    if S[i]<cur:
      A.append(S[i])
      break
    else:
      continue
  else:
    break
ans=len(A)
sign=0
A=[B[0]]
while True:
  cur=A[-1]
  if sign==0:
    S=W
    sign=1
  else:
    S=B
    sign=0
  for i in range(len(S)):
    if S[i]<cur:
      A.append(S[i])
      break
    else:
      continue
  else:
    break
ans=max(ans,len(A))
print(ans)