N = []
L = []
inf = 10 ** 18
N.append(int(input()))
L.append(list(map(int, input().split())) + [-inf])
N.append(int(input()))
L.append(list(map(int, input().split())) + [-inf])
for i in range(2):
    L[i].sort(reverse=True)
    
ans = 0
for i in range(2):
    flag = i
    ind = [0, 0]
    v = inf
    cnt = 0
    while ind[flag] != N[flag]:
        
        while L[flag][ind[flag]] >= v and ind[flag] != N[flag]:
            ind[flag] += 1
        if ind[flag] != N[flag]:
            cnt += 1
            v = L[flag][ind[flag]]
            
            ind[flag] += 1
            flag = 1 - flag
        # print("test", i, cnt, flag, L[flag][ind[flag]], ind[0], ind[1])
    ans = max(ans, cnt)
print(ans)