nw = int(input())
W = list(map(int, input().split()))
nb = int(input())
B = list(map(int, input().split()))
W.sort(reverse = True)
B.sort(reverse = True)
ans = 0
wp = 0
bp = 0
bef = 1 << 40
while 1:
    while wp != nw and W[wp] >= bef:
        wp += 1
    if wp == nw:
        break
    ans += 1
    bef = W[wp]
    
    while bp != nb and B[bp] >= bef:
        bp += 1
    if bp == nb:
        break
    ans += 1
    bef = B[bp]
    
ans2 = 0
wp = 0
bp = 0
bef = 1 << 40
while 1:
    while bp != nb and B[bp] >= bef:
        bp += 1
    if bp == nb:
        break
    ans2 += 1
    bef = B[bp]
    
    while wp != nw and W[wp] >= bef:
        wp += 1
    if wp == nw:
        break
    ans2 += 1
    bef = W[wp]
print(max(ans, ans2))