Nw = int(raw_input())
W = map(int,raw_input().split())
Nb = int(raw_input())
B = map(int,raw_input().split())
WB = sorted([[w,"w"] for w in W] + [[b,"b"] for b in B])[::-1]

bar,col = WB[0]
ans = 1
for i,wb in WB[1:]:
    if wb != col and i < bar:
        ans += 1
        col = wb
        bar = i
print ans