nw = int(input())
w = sorted(map(int,input().split()))[::-1]
nb = int(input())
b = sorted(map(int,input().split()))[::-1]

l = []
for i in w:
    l.append([i, 'w'])
for i in b:
    l.append([i, 'b'])
l = sorted(l)[::-1]

x = 1
if w[0] != b[0]:
    y = l[0][0] # length
    z = l[0][1] # color
    for i in range(1, len(l)):
        if l[i][0] < y and l[i][1] != z:
            x += 1
            y = l[i][0]
            z = l[i][1]

else:
    x1 = 0
    y = w[0]
    z = 'w'
    for i in range(1, len(l)):
        if l[i][0] < y and l[i][1] != z:
            x1 += 1
            y = l[i][0]
            z = l[i][1]
    
    x2 = 0
    y = b[0]
    z = 'b'
    for i in range(1, len(l)):
        if l[i][0] < y and l[i][1] != z:
            x2 += 1
            y = l[i][0]
            z = l[i][1]
    
    x += max(x1, x2)
    
print(x)