import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines

readline()
W = sorted(map(int,readline().split()))
readline()
B = sorted(map(int,readline().split()))

def F(W,B):
    W = W[:]
    B = B[:]
    x = W.pop()
    n = 1
    while True:
        while B and B[-1] >= x:
            B.pop()
        if not B:
            return n
        x = B[-1]
        n += 1
        W,B = B,W

answer = max(F(B,W), F(W,B))
print(answer)