def pyrm_count(first, second):
    fi = 1
    si = 0
    pyrm_cur = first[0]
    cur = True
    count = 1
    while True:
        tmp = 100
        if cur:
            if si >= len(second):
                return count
            while si < len(second):
                tmp = second[si]
                si += 1
                if pyrm_cur > tmp:
                    pyrm_cur = tmp
                    count += 1
                    cur = not cur
                    break
        else:
            if fi >= len(first):
                return count
            while fi < len(first):
                tmp = first[fi]
                fi += 1
                if pyrm_cur > tmp:
                    pyrm_cur = tmp
                    count += 1
                    cur = not cur
                    break




Nw = int(input())
W = sorted(map(int, input().split(" ")), reverse=True)
Nb = int(input())
B = sorted(map(int, input().split(" ")), reverse=True)

print(max(pyrm_count(W, B), pyrm_count(B,W)))