def f(y, z):
    x = 0
    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]
    return x
    
nw = int(input())
w = list(map(int,input().split()))
nb = int(input())
b = list(map(int,input().split()))

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]
    z = l[0][1]
    x += f(y, z)
else:
    y = max(w)
    z = 'w'
    x1 = f(y, z)
    y = max(b)
    z = 'b'
    x2 = f(y, z)
    x += max(x1, x2)

print(x)