nw=int(input())
w=list(map(int,input().split()))
nb=int(input())
b=list(map(int,input().split()))
w.sort()
w.reverse()
b.sort()
b.reverse()
L1=[w[0]]
pw1=1
pb1=0
for i in range(100):
  if i%2==0:
    if pb1!=len(b):
      while b[pb1]>=L1[-1]:
        pb1+=1
        if pb1==len(b):
          break
      if pb1!=len(b):
        L1.append(b[pb1])
      else:
        break
    else:
      beak
  else:
    if pw1!=len(w):
      while w[pw1]>=L1[-1]:
        pw1+=1
        if pw1==len(w):
          break
      if pw1!=len(w):
        L1.append(w[pw1])
      else:
        break
    else:
      break
L2=[b[0]]
pw2=0
pb2=1
for i in range(100):
  if i%2==1:
    if pb2!=len(b):
      while b[pb2]>=L2[-1]:
        pb2+=1
        if pb2==len(b):
          break
      if pb2!=len(b):
        L2.append(b[pb2])
      else:
        break
    else:
      break
  else:
    if pw2!=len(w):
      while w[pw2]>=L2[-1]:
        pw2+=1
        if pw2==len(w):
          break
      if pw2!=len(w):
        L2.append(w[pw2])
      else:
        break
    else:
      break
print(max(len(L1),len(L2)))