INF = 1 << 60
input()
W = list(map(int, input().split()))
input()
B = list(map(int, input().split()))


def f(x, ai, a, bi, b) -> int:
    # x の上に a を積む
    for i in range(ai, len(a)):
        if a[i] < x:
            return f(a[i], bi, b, i+1, a) + 1

    return 0


W.sort(reverse=True)
B.sort(reverse=True)
ans = max(f(INF, 0, W, 0, B), f(INF, 0, B, 0, W))
print(ans)