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 = [[int(i), 'w'] for i in input().split()]
nb = int(input())
b = [[int(i), 'b'] for i in input().split()]
l = sorted(w + b)[::-1]

if max(w) != max(b):
    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+1)