Nw = input()
W = sorted(list(set(map(int, raw_input().split()))))
Nb = input()
B = sorted(list(set(map(int, raw_input().split()))))
last = None
ans = 0
while len(W) > 0 and len(B) > 0:
    if W[-1] == B[-1]:
        W.pop()
        B.pop()
        ans += 1
        if last == 'B':
            last = 'W'
        elif last == 'W':
            last == 'B'
    elif W[-1] > B[-1]:
        W.pop()
        if last == 'B' or last == None:
            ans += 1
            last = 'W'
    else:
        B.pop()
        if last == 'W' or last == None:
            ans += 1
            last = 'B'

if len(W) > 0 and (last == 'B' or last == None):
    print ans + 1
elif len(B) > 0 and (last == 'W' or last == None):
    print ans + 1
else:
    print ans