from collections import *
import sys

sys.setrecursionlimit(10 ** 6)
int1 = lambda x: int(x) - 1
p2D = lambda x: print(*x, sep="\n")
def II(): return int(sys.stdin.readline())
def MI(): return map(int, sys.stdin.readline().split())
def MF(): return map(float, sys.stdin.readline().split())
def LI(): return list(map(int, sys.stdin.readline().split()))
def LF(): return list(map(float, sys.stdin.readline().split()))
def LLI(rows_number): return [LI() for _ in range(rows_number)]

def main():
    wn = II()
    ww = LI()
    bn = II()
    bb = LI()
    ww.sort()
    bb.sort()
    h = 1
    wid = ww[wn - 1]
    wi = wn - 2
    bi = bn - 1
    while 1:
        while bi>=0 and bb[bi] >= wid: bi -= 1
        if bi<0:break
        wid=bb[bi]
        h+=1
        bi-=1
        while wi>=0 and ww[wi] >= wid: wi -= 1
        if wi<0:break
        wid=ww[wi]
        h+=1
        wi-=1
    ans=h
    h = 1
    wid = bb[bn - 1]
    wi = wn - 1
    bi = bn - 2
    while 1:
        while wi>=0 and ww[wi] >= wid: wi -= 1
        if wi<0:break
        wid=ww[wi]
        h+=1
        wi-=1
        while bi>=0 and bb[bi] >= wid: bi -= 1
        if bi<0:break
        wid=bb[bi]
        h+=1
        bi-=1
    if h>ans:ans=h
    print(ans)


main()