nw = int(input())
w = sorted(list(map(int, input().split())), reverse=True)
nb = int(input())
b = sorted(list(map(int, input().split())), reverse=True)
blocks = []
for x in w:
    blocks.append((x, 0))
for x in b:
    blocks.append((x, 1))
blocks.sort(reverse=True)
cnt = 1
top = blocks[0][0]
color = blocks[0][1]
i = 1
while i < nw + nb:
    x, c = blocks[i]
    if x < top and c != color:
        top = x
        color ^= 1
        cnt += 1
    i += 1
ans = cnt
color = blocks[0][1]
i = 0
while i < nw + nb:
    _, c = blocks[i]
    if c != color:
        color ^= 1
        break
    i += 1
top = blocks[i][0]
cnt = 1
while i < nw + nb:
    x, c = blocks[i]
    if x < top and c != color:
        top = x
        color ^= 1
        cnt += 1
    i += 1
ans = max(ans, cnt)
print(ans)